Refs #2072

We most probably shouldn't be running any further when there is some
unexpected panic. Some unknown error happened, and so we don't know if
that will result in the validator signing an invalid thing. It might be
worthwhile to explore a mechanism for manual resuming via some console
or secure RPC system, but for now, halting the chain upon unexpected
consensus bugs sounds like the better option.

Closes #2072

Our Tempfile was just a wrapper on ioutil that panicked instead of error.

Our Tempdir was a less safe variant of ioutil's Tempdir.

* Removed unnecessary onStart & onStop calls in reactor

* Refactor OnStart & OnStop in reactor

* Removed redundant OnStart func in reactor

This PR changes ABCI time format from int64 (Unix seconds) to WKT (WellKnownType) google.protobuf.Timestamp.

Refs #1857

Reasons:

better precision
standard DT for proto

* update Gopkg.lock
* [makefile] remove extra grep
    - go list excludes vendor by default now
* proto3 timestamp
* [docs/abci-spec] note about serialisation format
* make time non-nullable

* update changelog

* txAvailable is always true

Refs #2021, #1920

* remove debug message

No additional value. `enterPropose` log message should be enough.

Refs #2021, #1920

* #1920 try to fix race condition on proposal height for published txs

- related to create_empty_blocks=false
- published height for accepted tx can be wrong (too low)
- use the actual mempool height + 1 for the proposal
- expose Height() on mempool

* #1920 add initial test for mempool.Height()

- not sure how to test the lock
- can the mutex reference be of type Locker?
-- this way, we can use a "mock" of the mutex to test triggering

* #1920 use the ConsensusState height in favor of mempool

- gets rid of indirections
- doesn't need any "+1" magic

* #1920 cosmetic

- if we use cs.Height, it's enough to evaluate right before propose

* #1920 cleanup TODO and non-needed code

* #1920 add changelog entry

allows multiple RPC requests to query consensus state

Refs #1772

Currently the top level directory contains basically all of the code
for the crypto package. This PR moves the crypto code into submodules
in a similar manner to what `golang/x/crypto` does. This improves code
organization.

Ref discussion: https://github.com/tendermint/tendermint/pull/1966

Closes #1956

make BlockMeta Header a non-pointer

Refs #693

This reverts commit 58d0c8de89.

This reverts commit d02c5d1e30.

Refs #646

Refs #1839

* When create_empty_blocks=false, we don't enterPropose until we
* receive a transaction, but if we then receive a complete proposal,
* we should enterPrevote. A guard in addProposalBlockPart was checking if
* step==Propose before calling enterPrevote, but we need it to be step<=Propose,
* since we may not have seen a tx.
* This was discovered by disabling mempool broadcast, sending txs to
* peers one a time, and observing their consensus logs.

makes TestListener never quit

This reverts commit 96a3502

- move prometheus metrics into internal packages
- *Option structs
- misc. format changes

* updateToState exits early if the state isn't new, which happens after
* fast syncing. This results in not sending a NewRoundStep message. The mempool
* reactor depends on PeerState, which is updated by NewRoundStep
* messages. If the peer never sends a NewRoundStep, the mempool reactor
* will think they're behind, and never forward transactions. Note this
* only happens when `create_empty_blocks = false`, because otherwise
* peers will move through the consensus state and send a NewRoundStep
* for a new step soon anyways. Simple fix is just to send the
* NewRoundStep message during updateToState even if exit early

* all: gofmt

Run 'gofmt -w .' from project root.

* Update changelog to say that I ran gofmt

* Revert "Update changelog to say that I ran gofmt"

This reverts commit 956f133ff0.