Fixes Fatal error: Call to a member on a non-object

Fixes "Fatal error: Call to a member function addLine() on a non-object" when commit has 0 updated files
Merge pull request #16 from MSylvia/master

Fixes fatal error when a commit has 0 updated files
Updating dependencies
Get commit body, fixes #1
Check for git version before using -c option, fixes #9
Branch fixes
Make "no description" really mean "no description"
Updating dependencies
Refactoring the git model
Scanning and managing directories should not be Gitter's responsibility
Fixing tests
Merge pull request #22 from klaussilveira/refactoring

Refactoring the library for proper reusability
Merge branch 'master' of https://github.com/klaussilveira/gitter

Conflicts:
	lib/Gitter/Model/Blob.php