added "home" command like the npm one, opens a package in your browser
some minor refactorings
tiny refactorings
escape shell args
rename command
some tiny refactorings
Merge remote-tracking branch 'digitalkaoz/new_home_command'

Conflicts:
	src/Composer/Console/Application.php
Add browse command to docs, add a -H flag and tweak fallback mechanism to maximize chances of opening something, refs #2445
Tweak some page titles