implementation for setting the passphrase by @abika

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>

Conflicts:
	app/src/main/java/org/kontalk/authenticator/Authenticator.java
	app/src/main/java/org/kontalk/ui/PreferencesActivity.java
	app/src/main/res/values/strings.xml
Change key passphrase preference, thanks to @abika (UNTESTED)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
First step of converting userId to JID (not tested much)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
UsersProvider converted to full JID usage too

That should be all. But it needs some extensive
testing before merge to master.

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Fix Travis-CI build configuration (fix #191)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Merge branch 'master' into full_jid
Clean some extra forgotten logs

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Merge branch 'master' into audio_message