save transactions to blockstore

move to a separate module

benchmark KVIndexer

batch write transactions

Benchmarks:

```
BenchmarkKVIndexerIndex-2         100000            516300 ns/op
PASS
ok      github.com/tendermint/tendermint/blockchain/tx  56.506s

5,16 s for 10000 transactions
1 s for 2000 transactions
```

```
BenchmarkKVIndexerIndex-2       h 3000000             8622 ns/op
PASS
ok      github.com/tendermint/tendermint/blockchain/tx  34.210s

86 ms for 10000 transactions
16 ms for 2000 transactions
```

```
BenchmarkKVIndexerIndex1-2               5000000              7160 ns/op
BenchmarkKVIndexerIndex500-2               20000           1750411 ns/op
BenchmarkKVIndexerIndex1000-2              10000           3573973 ns/op
BenchmarkKVIndexerIndex2000-2               5000           7836851 ns/op
BenchmarkKVIndexerIndex10000-2              1000          33438980 ns/op
PASS
ok      github.com/tendermint/tendermint/blockchain/tx  209.482s

7,8 ms for 2000 transactions
```

[state] write test for ApplyBlock

review comments

- move txindexer to state
- fix type

save Tx Index as well

do not store tx itself in the result

consensus: timeout on replayLastBlock

added use of Cobra CLI

rename TMROOT to TMHOME

close ws connection on Stop

needed for 3044f66ba9
See https://github.com/tendermint/tools/issues/6

Error:
```
Expected nil, but got: encoding/hex: invalid byte: U+0078 'x'
```

echo means we're returning the input, which is exactly what this
function does.

rename ClientURI -> URIClient, ClientJSONRPC -> JSONRPCClient

support key-value params in JSONRPC

Error from tendermint:

```
panic: Expected map but got type string [recovered]
        panic: Expected map but got type string

goroutine 82 [running]:
testing.tRunner.func1(0xc420464000)
        /usr/local/go/src/testing/testing.go:622 +0x29d
panic(0xa1fda0, 0xc4201eecd0)
        /usr/local/go/src/runtime/panic.go:489 +0x2cf
github.com/tendermint/tendermint/rpc/test.waitForEvent(0xc420464000, 0xc420064000, 0xae6fae, 0x8, 0xae6f01, 0xc2e998, 0xc2e9a0)
        /home/vagrant/go/src/github.com/tendermint/tendermint/rpc/test/helpers.go:179 +0x53a
github.com/tendermint/tendermint/rpc/test.TestWSNewBlock(0xc420464000)
        /home/vagrant/go/src/github.com/tendermint/tendermint/rpc/test/client_test.go:190 +0x12e
testing.tRunner(0xc420464000, 0xc2e9a8)
        /usr/local/go/src/testing/testing.go:657 +0x96
created by testing.(*T).Run
        /usr/local/go/src/testing/testing.go:697 +0x2ca
```

Suggested in https://github.com/tendermint/go-rpc/pull/9#discussion_r105098390

Error from tendermint:
```
panic: runtime error: index out of range

goroutine 82 [running]:
github.com/tendermint/tendermint/vendor/github.com/tendermint/go-rpc/server.jsonParamsToArgsWS(0xc4200960e0, 0xc42024d4a0, 0xc420215380, 0x3, 0x0, 0x0, 0xc420215383, 0x9, 0xc42024d4a0, 0xf1ecc0, ...)
        /home/vagrant/go/src/github.com/tendermint/tendermint/vendor/github.com/tendermint/go-rpc/server/handlers.go:184 +0x654
github.com/tendermint/tendermint/vendor/github.com/tendermint/go-rpc/server.(*wsConnection).readRoutine(0xc4201fd0e0)
        /home/vagrant/go/src/github.com/tendermint/tendermint/vendor/github.com/tendermint/go-rpc/server/handlers.go:496 +0x3a9
created by github.com/tendermint/tendermint/vendor/github.com/tendermint/go-rpc/server.(*wsConnection).OnStart
        /home/vagrant/go/src/github.com/tendermint/tendermint/vendor/github.com/tendermint/go-rpc/server/handlers.go:377 +0x45
```

this breaks the client's code (e.g. tendermint)

also remove it afterwards

update Dockerfile for 0.9.0 release

Q: what was the reason to create them?

More changes:

- remove Client interface (reason: empty)
- introduce HTTPClient interface, which can be used for both ClientURI
  and ClientJSONRPC clients (so our users don't have to create their own) (Refs #8)
- rename integration tests script to `integration_test.sh`
- do not update deps on `get_deps`