Fixed the build for xcode 6
wip

Conflicts:
	src/Sync.hs
Added testsuite
Added some tests
Added diff for FileTree
Improved diff function
Added function to compute files to upload
Added check for changes on server
Removed old impl
Working new sync
Removed old code
Removed unused code
Refactor FTZipper traversal
Removed gmp dependency
Refactor
Added "Sync now" menu item
Improved error handling and logging
Added logging of exceptions
Added support for "slash" in filename/subject
Refactor file related to separate module