APScheduler simply replaced by twisted reactor
Rename all functions prefixed with APS to Schedule
Improved Async Jobs exception resiliency and logging
Merge branch 'fix_issue_815' of github.com:globaleaks/GLBackend into fix_issue_815
fixed issue https://github.com/globaleaks/GlobaLeaks/issues/818
fixed issue https://github.com/globaleaks/GlobaLeaks/issues/819
fixed issue https://github.com/globaleaks/GlobaLeaks/issues/819
fixed a bug in streaming sha calculation
fixed issue https://github.com/globaleaks/GlobaLeaks/issues/817
Merge pull request #204 from globaleaks/fix_issue_815

APScheduler simply replaced by twisted reactor
removed debug print
Merge branch 'fix_issue_817'
Merge branch 'fix_issue_818'
fixed issue globaleaks/GlobaLeaks#819
completed unittests related to https://github.com/globaleaks/GlobaLeaks/issues/819
aligned test_gpg to last commit
Merge branch 'fix_issue_819'
corrected default admin mail
removed debug function
readded some code removed due to a misleading comment (comment updated)