Fix initialiser for PBGitRef
Implement NSCopying for PBGitRef. Return self since it is an immutable value object.
Remove workingDirectory property from PBGitRevSpecifier - it doesn't belong there.
Use PBGitRef instead of PBGitRevSpecifier
Remove unused headers.
Fix isEqual: and remove declaration from header since it is already declared in NSObject.
Reorder headers and remove unused ones.
Remove PBSourceViewItems.h. Import only the necessary headers where used instead.
Remove NSString_RegEx, use NSRegularExpression instead.
Remove NSFileHandleExt