Fix get_blocked() in XEP-0191
Fix certificate expiration scheduler

timedelta.seconds does not store the total seconds of a time span.
Internally, seconds is the next smaller unit to days, hence
timedelta.seconds will never exceed (or reach) the number of seconds
in a day (60*60*24=86400)
Special plugin loading case for xep_0115 no longer needed.
Merge pull request #197 from FlorianFieber/develop

Fix get_blocked() in XEP-0191
Fix get_blocked() in XEP-0191
Add catch-all chatstate event.
Merge branch 'master' into develop
Map <group /> elements with no content to '' instead of None.
Merge branch 'master' into develop
Add support for XEP-0235: OAuth over XMPP
Add support for XEP-0279: Server IP Check
Don't perform caps lookup if the disco info is already known.
Add support for Google's X-OAUTH2 SASL mechanism
Add support for XEP-0049: Private XML Storage
Don't break checking certs for localhost.
Merge branch 'master' into develop
Remove race condition when aborting while connecting/reconnecting.
Merge branch 'master' into develop
Simplify stringifying XML
Fix deleting non-existent stanza plugins.