[minor style] Remove unused `require` and fix comment
[minor] Fix `vim` ignore
[refactor] Poll SSH instead of fixed timeout while bootstrapping

Various compute providers need different time to bring the VM up and
make it accessible under some IP. Previously we'd simply wait a minute
before trying to bootstrap the server.
This polls VM over SSH to determine when it's up and ready to accept
commands.
Merge pull request #97 from nodejitsu/ssh-poll

[refactor] Poll SSH instead of fixed timeout while bootstrapping
[dist] Bump version to 0.6.10
[fix] Dont attempt to run ssh or scp commands with empty Arrays
[api] Added `options.afterActive` to `Bootstrapper.prototoype.createServer`.
[api] Made `Bootstrapper.prototoype._sshPoll` take `pollInterval` and `pollMax` options.
[fix] s/tries/attempts/
[dist] Version bump. 0.6.11
[dist fix] Version bump. 0.6.12: Dont publish test fixtures to npm.