fixed bug related to GLApiCache and https://s3.amazonaws.com/archive.travis-ci.org/jobs/36482622/log.txt
fixed bug related to GLApiCache and https://s3.amazonaws.com/archive.travis-ci.org/jobs/36482622/log.txt

when we add/update/delete a context or a receiver, both the receivers cache and
the contexts cache must be updated as well.

vodkina/GlobaLeaks,vodkina/GlobaLeaks,vodkina/GlobaLeaks,vodkina/GlobaLeaks