Add php analyzer

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.0'
Activate and deactivate an extension should return boolean.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.0'
Show show alert if unable to activate a missing extension from artisan. Closes #38.

Signed-off-by: crynobone <crynobone@gmail.com>