Possibly fixes #4842. I'm not familiar with the doc generation pipeline, but other images under `imgs/` seem to work so just cargo-culting it.

Reduce the number of targets and make the buildsystem more
flexible by parsing the TENDERMINT_BUILD_OPTIONS command
line variable (a-la Debian, inspired by dpkg-buildpackage's
DEB_BUILD_OPTIONS), e.g:

 $ make install TENDERMINT_BUILD_OPTIONS='cleveldb'

replaces the old:

 $ make install_c

Options can be mix&match'd, e.g.:

 $ make install TENDERMINT_BUILD_OPTIONS='cleveldb race nostrip'

Three options are available:
- nostrip: don't strip debugging symbols nor DWARF tables.
- cleveldb: use cleveldb as db backend instead of goleveldb;
  it switches on the CGO_ENABLED Go environment variale.
- race: pass -race to go build and enable data race detection.

This changeset is a port of gaia pull request: cosmos/gaia#363.

Closes #4202

- nobody's supporting them
- users who want to try TM should use pre-build binaries
- devs should be able to install using git clone (or use Vagrant)
- validators don't use them (my guess)

* update version

* remove version from versions file

* docs theme

* vuepress-theme-cosmos

* version bump

* changes to docs

* more code changes

* sidebar order fix

* moar changes

* fixed dev sessions title

* fixed dev sessions title, again

* specs should show up in sidebar

* contents cards

* version bump

* sidebar, rpc

* version bump

* custom footer and super naive search

* version

* minor change to vuepress

* move swagger file

* pre and post scripts

* build

* changed docs build process

* added deployment config

* updated versions file and added deployment filters

- in the makefile update `get_tools` was changed to just `tools`

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* Quick link fixes throughout docs and repo

- used markdown link tester to find broken links

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* minor change remove slash

* pr comments

* minor fix

* remove docker.develop

* remove master tag

* Added a disaclaimer so the user is aware of binary

- added disclaimer for `-s -w`

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

* move up to compile

* Update to using go mod from dep

* Remove references to make get_vendor_deps

* Specify go version

* Set GO111MODULE=on and add -mod=readonly

* Fix exported env

* switch to using go1.12 everywhere

* Fix test scripts

* Typo:

* Prepend GO111MODULE=on

* remove dep cache

* Revert "remove dep cache"

This reverts commit 45117bda

Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>

* bring back the dependency cache and change it to cache modules instead
of vendored deps; also:

 - bump version for dependency cache
 - bump version on pkg-cache (includes modules directory)

Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>

* remove some more traces of dep:
 - remove Gopkg.(toml | lock)
 - update contributing guidlines
 - set global default in circleci (GO111MODULE=on)

Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>

* global var failed for `test_cover` with
`go: unknown environment setting GO111MODULE=true`
although the var was `GO111MODULE: on`

Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>

* Changelog pending entry

Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>

* Add bbolt dependency to go.mod

Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>

* move -mod=readonly to build flags

* libs/db: conditional compilation

For cleveldb: go build -tags cleveldb
For boltdb: go build -tags boltdb

Fixes #3611

* document db_backend param better

* remove deprecated LevelDBBackend

* update changelog

* add missing lines

* add new line

* fix TestRemoteDB

* add a line about boltdb tag

* Revert "remove deprecated LevelDBBackend"

This reverts commit 1aa85453f7.

* make PR non breaking

* change DEPRECATED label format

https://stackoverflow.com/a/36360323/820520

* update docs

- make install_c cmd (install)
- explain node IDs (quick-start)
- update UPGRADING section (using-tendermint)

* use git clone with JS example

JS devs may not have Go installed and we should not force them to.

* rewrite sentence

Closes #2884

* docs: fix links

* docs: add readme from each section to the sidebar

* minor doc cleanup

* docs/tools: link fixes and readme

* docs/networks: networks/local/README.md

* docs: update vuepress config

* docs: fixes from review

* mempool: update some comments

* make build_c

* docs: notes about databases and WAL files

* docs: determinism. closes #1279

* docs: small note about query paths. closes #2090

* docs: gas

* docs: abci consensus params

Why:
original fork is abandoned and not supported anymore.

Changes:
- LevelDB 1.19 (LevelDB and Snappy are both compiled and linked statically, so while you will not need them installed on your target machine, you should have a roughly compatible version of libstdc++.)
- snappy and lz4 libs included by default

This reverts commit d02c5d1e30.