Fix issue #577.

By first disabling android:linksClickable on the individual
conversation_item_body, and handle the click event forwarding in the
fragment that contains them.
No need for ivar. Use local variable.
Merge branch 'fix-issue-577' of https://github.com/santa4nt/TextSecure

Conflicts:
	res/layout/conversation_item_received.xml
	res/layout/conversation_item_sent.xml
	src/org/thoughtcrime/securesms/ConversationFragment.java
minor group and conversation ui fixes

Fixes #1347
Fixes #1341
// FREEBIE
Localize some group update strings

Fixes #1160
// FREEBIE
allow empty group avatar updates and log updates

// FREEBIE
slight refactoring and avatar unset fixes

// FREEBIE