Add support for -isystem and -iquote

Fixes #109
Support both -isystem/foo and -isystem /foo (same goes for -include and -iquote)

Fixes #109 (hopefully for good)
Support loading JSON formatted compilation databases

Fixes #111
Fall back to default-directory for rtags-buffer-status when path is nil
Make dump work again. Send contents along
Fix optional arg parsing for -J
Always use canonical cursor for symbol joining.
Kill compilejob. Also make all messages references.
Kill builds
Reintroduce compiler manager.
Bump rct and remove warning
Simplify dirtying a little. Remove the mModifiedFiles timeout stuff.
Remove rtags_args.
Add some dtl-cpp stuff
No more rfiles.
Build on OS X
Add (defun rtags-is-running)
Bump auto-complete for no good reason
Fewer timers.
Make sure there really is such a buffer.