Merge pull request #19 from Azmisov/master

Improved GUI for maya checkout tool
Added current Mari tools
add more mari scripts
Merge pull request #20 from andrewRasmussen/master

Added current Mari tools
Now displaying comments in checkout and rollback dialogs
Merge pull request #21 from melissaEdge/master

Now displaying comments in checkout and rollback dialogs
added comments on Houdini checkin
Merge pull request #22 from melissaEdge/master

added comments on Houdini checkin
finished refactoring otl management
Node unlock fixed in Houdini
Merge pull request #23 from melissaEdge/master

Node unlock fixed in Houdini
Added desktop icons; probably need to be tested on a couple machines to make sure they work