Updating topic and channel length

The NSQ docs specify that a channel and/or topic name can be up to 64
characters in length. Note: this is a change that ocurred in the NSQ
0.2.28 release hence the version bump in .travis.yml.

Fixes https://github.com/dudleycarr/nsqjs/issues/40
Bumping nsq version to 0.2.31
Bumping and syncing version numbers
Fixing path passed to tar command
Merge pull request #41 from joshgummersall/update-topic-and-channel-length

Updating topic and channel length