Updated .gitignore.
Fixed crash when clicking empty cell in presentation table.
ACPreferenceController:
	- Preference Window will not be hidden when the application becomes inactive.
RsyncTask:
	- Fixed update / delete problem. Local files will be either left untouched (Keep locale changes) OR deleted (reset to version on server).
Fixed memory leaks.
Fixed crash when opening empty pagination view.
Fixed memory leak.
Corrected accessor attributes definition.
Corrected string usage.
Corrected property declaration for IBOutlets.
Fixed retention bug / leak.
Leaks fixed.
Upped revision number to  1.5.1
Made 'Ok'-Button in Edit-Dialog more responsive.
Bumped to version number 1.5.1
Added exclusion of umlauts and sharp s in directory names.
Added new DMG background.
v1.5.2 release candidate.
PresentationLibrary:
	- Corrected cleaning directory name.