Reimplementation of Asana Throttling

All new requests will be queued instead of bombarding Asana with more
requests.
Removing stuff not needed anymore
ThrottleFor Should also be static
Added a function to refresh the attributes (for now only available for Projects)
Uncommit an annoying Visual Studio 2013 bug
Merge pull request #13 from niieani/asynctasks

Reimplementation of Asana Throttling