GOA: ignore non-Telepathy accounts

This fixes a crash when trying to remove a GOA account without chat
support.

https://bugzilla.gnome.org/show_bug.cgi?id=704469
Don't dereference a NULL error

libsecret returns FALSE without an error in some cases but we
unconditionally dereference it, causing a crash.

https://bugzilla.gnome.org/show_bug.cgi?id=692105
debug-window: ellipsize the message text renderer

Ridiculously long messages were crashing empathy-debugger because Pango
weren't able to display them all.

https://bugzilla.gnome.org/show_bug.cgi?id=696328
Merge branch 'gnome-3-8'

Conflicts:
	libempathy/empathy-keyring.c