changed exceptions to gitwrapper exceptions
added a null param handler function
added null-checking
Added .gitkeep to add /data/users dirs
Merge branch 'master' of https://github.com/ZAM-/TeamworkEnglewoodGit
Merge pull request #138 from ZAM-/master

Added /data/users/.gitkeep
Merge https://github.com/CSC495-2014/TeamworkEnglewoodGit into testing
Merge pull request #1 from samuelfrench/testing

Testing