Swap GAE skipping test order

So that test on python2.6 get the proper skip message (GAE might be
installed but cannot run on python 2.6.
Add a process_response method to evelink.api.API

Extract the result and cache delay info from an 
api call response.
Add api_result argument to all api call wrapper methods

Allow to pass the api results to avoid using api.get()
add async methods to GAE api client