Merge pull request #195 from Ansa89/italian-translation

Italian translation: update
Added buttons for microphone and volume control
added stylesheets for micButton and volButton
micButton and volButton were added to chatForm, but micButton for some
reason is blinking
realized micButton for calls
fixed some bugs with micButton
fixed some bugs with micButton
changed size of micButton and volButton
added easy installation on OS X
Merge pull request #198 from ReDetection/master

steps to easy install qTox on OS X with homebrew
sort the friendlist by contact Status
Merge pull request #199 from apprb/flist

sort the friendlist by contact Status
Italian translation: update