Fixed AppEngineCache.get not returning cached value
Fixed GAE api using urlfetch

The API class using google app engine's urlfetch wasn't updated after
the streamlining of API.get in commit
1fa804ba6d1d39738937996f77332cf19241abba
Merge branch 'master' of git://github.com/dinoboff/evelink
Modify API.get to return timestamps, and the mock api result generator to return them (BREAKS TESTS)
Fix broken tests for API.get
Include current time and expiry in APIErrors
Update Account to pass through timestamps
Update Char to pass through timestamps
Update Corp to pass through timestamps
Update EVE to pass through timestamps
Update Map to pass through timestamps
Update Server to pass through timestamps
Update shared parsing tests to ignore new timestamps
Update requests tests for new timestamps
Update README.md to reflect additional return values
Make API.get return an APIResult namedtuple
Update wrapper functions to return api.APIResult namedtuples
Update README.md to deal with APIResult namedtuples
Fix consistency of return statements
Make the APIError fields more consistently named