Merge pull request #1 from lludo/master

Fix typo in readme.
Added import option
Cleaned up weak selves
Renamed forkingRemoteRepositoryPanel to progressPanel
Changed ACCodeSnippetSerialization to write fields in alphabetical order on keys to make it deterministic
Updated README
Cleanup
Fixed crash when importing snippets
Merge pull request #3 from acoomans/fix-duplicated_identifier_crash

Fix duplicated identifier crash
Added Xcode 5.1 as compatible
Fixed remove/restore system code snippets