Merge pull request #1 from congpeijun/master

Implement some command
Update dependency list to newest version of Guzzle
Delete composer.lock
Ignore composer.lock in library
Pin guzzle at v3.8.1
Merge pull request #2 from congpeijun/master

Implement ls command, improve some functions.
Run unit tests.
Add travis ci configure.
Implment updatedir command.