fixed functional tests
Removed GeoGitOpException and adapted classes that inherited from it
Spelling fixes in tests - "nonexistent"
Merge pull request #44 from dwins/nonexistant-to-nonexistent

Spelling fixes in tests - "nonexistent"
Merge remote-tracking branch 'volaya/patch-conflict' into patch-conflict
Extended log command with additional options and improved behaviour,
Added a ParseTimestamp operation with support for different syntaxes