dockerfile for develop branch

collect and add docker logs to CircleCI artifacts (Refs #387)

```
local_testnet_1
Failed to remove container (local_testnet_1): Error response from daemon: Unable to remove filesystem for 74e1104c705d4f21137bbe9e6710f33511948fc04d26475b482d1314fe70d537: remove /var/lib/docker/containers/74e1104c705d4f21137bbe9e6710f33511948fc04d26475b482d1314fe70d537/shm: device or resource busy
local_testnet_2
Failed to remove container (local_testnet_2): Error response from daemon: Unable to remove filesystem for 6f2ec44e01afd85875c1d9958afa957f1623ed9464df2b4fcac06feb8254145e: remove /var/lib/docker/containers/6f2ec44e01afd85875c1d9958afa957f1623ed9464df2b4fcac06feb8254145e/shm: device or resource busy
local_testnet_3
Failed to remove container (local_testnet_3): Error response from daemon: Unable to remove filesystem for 6160c73d45376920d90473a487a07f0e283e383011a0d23050b22cd82ab5d255: remove /var/lib/docker/containers/6160c73d45376920d90473a487a07f0e283e383011a0d23050b22cd82ab5d255/shm: device or resource busy
local_testnet_4
Failed to remove container (local_testnet_4): Error response from daemon: Driver btrfs failed to remove root filesystem c93a30d66ff3710617915a8f6075755ebc45aebf73569420225105cc81003e2f: Failed to destroy btrfs snapshot /var/lib/docker/btrfs/subvolumes for cac56069a3682b6d133e239f479fb82a67c4ccd09b877794d9f440a1125d59d6: operation not permitted

* [15:37:40] stopping rsyslog container
Failed to remove container (rsyslog): Error response from daemon: Driver btrfs failed to remove root filesystem 477287a170a48156e663c55092257064e1f14770d0b6c634a9972893636d9451: Failed to destroy btrfs snapshot /var/lib/docker/btrfs/subvolumes for 76b66d582a478743c099f479bf88eb334ad303ef607f91021dfa58d28c9161eb: operation not permitted
make: *** [test_integrations] Error 1
```

Error:

```
Failed to remove container (rsyslog): Error response from daemon: Unable to remove filesystem
```

`make test_integrations` requires > 2Gi of memory

How: 1) we start syslog docker container 2) all other containers use
syslog logging driver to ship their logs to that container

[cli] cleanup gen_validator output

so we can pipe result to a file:

```
tendermint gen_validator > example.json
```

before this we had to cut first 3 lines:

```
tendermint gen_validator | sed 1,3d > example.json
```

* glide now gets installed as a part of make get_vendor_deps
* rm go .tar.gz file
* autoremove garbage
* set LC_ALL to en_US.UTF-8

ISSUE_TEMPLATE for Github

contributing.md

[docker] move to alpine base image

Improve CircleCI setup (WIP)

- update docker machine version to 0.9.0
- save coverage.txt as artifact
- save docker logs as artifact
- test if coverage.txt exists
- 2>&1 redirect stderr to stdout in tests

813Mb => 29.5Mb

Rename docker image to tendermint

permissions error during make dist

```
mv: cannot move ‘./build/dist/windows_386.zip’ to ‘./build/dist/tendermint_0.8.0_windows_386.zip’: Permission denied
```

The main reason is people usually expect docker image to have the same
name as the repo. Plus, tendermint is cleaner than tmbase.

tmbase would make sense if we had multiple docker images within
tendermint, but we don't.

- update golang to 1.7.4
- version as env variable
- change DATA_ROOT from /tendermint/data to /tendermint (it's not just
  data that gets stored in DATA_ROOT; we create data folder on start; as
  a result we get /tendermint/data/data, which is confusing)
- remove noninteractive env vars (do we really need these?)
- remove nodejs dep (some apps may require nodejs, but core is not one
  of them; it was convenient before, but now I believe we ought to
  remove it because other people who are using java do not want a
  bloated container with nodejs)
- build tendermint inside a container (once again, it was convenient
  before, but now I am testing kubernetes and I don't want to wait every
  time TM compiles)