Merge remote-tracking branch 'upstream/master'
Documentation fix.
Merge remote-tracking branch 'upstream/master'
Merge pull request #364 from tiennou/quickfixes

Documentation fix.
Remove unused variables
Remove a few potential memory leaks
Merge pull request #369 from yuklai/master_leaks

Remove a few potential memory leaks
Remove unused variables
Remove unused variables
Merge pull request #368 from yuklai/master_unusedVariables

Remove unused varilables.
Fixed #367: fixed -hostnameWithEmail:
Fixed crash in MCIndexSet (fixed #357)
Added conversion between NSIndexSet and MCOIndexSet (fixed #370)
Fixed #371: don't retain header when no result is returned
Merge remote-tracking branch 'upstream/master'
Outlook support in providers
whitespace
Merge pull request #380 from CodaFi/Providers-Outlook

Added provider for outlook.
Merge remote-tracking branch 'upstream/master'
ObjC interface to registering providers