disable all really weak cipher suites

With #959 all ciphers of the platform were enabled, but this also
includes several suites that are considered as very weak, even down to
NULL- and anon-ciphers which disable completely disable encryption
and/or authentication. Especially the anon-ciphers could be easily used
for a mitm-attack.

To remove all weak ciphers a blacklist with patterns of cipher-names was
added to Config.java. The blacklist is based on the "mandatory discards"
that Mozilla suggests to not use for TLS-servers because they are weak
or known to be broken.
https://wiki.mozilla.org/Security/Server_Side_TLS#Mandatory_discards

display geo uris as location. show 'send loction' in share menu if request location intent can be resolved

Some changes to the LED color in notifications !

Revert led light color

- Update mBuilder in NotificationService.java to ensure that the led is displayed at the right color.
CF: http://stackoverflow.com/questions/14953793/android-notification-led-doesnt-use-my-color#comment20991762_14953793
- Changed led Color to green to remember the icon color and led times

added XEP-0085: Chat State Notifications to docs

added XEP-0085: Chat State Notifications

otr4j has moved to Maven Central