Fix i18n basePath issuse

According to CPhpMessageSource specs  (http://www.yiiframework.com/doc/api/1.1/CPhpMessageSource#basePath-detail), basePath should be separeted with "/".
Merge pull request #73 from SilverFire/master

Fix i18n basePath issuse
Added note about `vagrant-vbguest` plugin
Added some guards to the Composer installation procedure at Vagrant provision script.
Merge remote-tracking branch 'origin/master'
Added note about the possibility to drop `apt-get update` from the provisioning step.
typo fix
changed double to single quotes
string concatenation style fixes
typo fix
small documentation improvements
documentation fix
added new line after help block end
fixed typos ('frontend' to 'backend')
string concatenation style fixes
string concatenation style fixes
Merge pull request #79 from xt99/master

typos fixes
Merge pull request #2 from clevertech/master

upstream