Remove brackets around nick names
Add brackets around sender when copying ChatLines

Only apply when Message::Type == Plain, though.
Remove brackets from default timestamp setting
von wegen unused…

Partly reverts 'b3cf44aa5773bb6a6e0a1ba8d0c1add841281b4b'
tx-sync.sh: fix for dumb terminal mode
BufferWidget: Remove minimumSize constraint
Travis: Update gcc to 4.8

Fixes Travis builds currently failing with:
  cc1plus: error: unrecognized command line option ‘-std=c++11’
Merge branch 'nobrackets' into frickel