The 'composer install' command is added to fix the travis build
Fixed cwd after composer install
Added dev dependencies install switch
Fixed path to simpletest installation directory
The '__FORM_STATE_HANDLER__' constant for travis configuration should be QFormStateHandler, not QSessionFormStateHandler

Since php-cli does not support the _SESSION variable.
Merge pull request #137 from olegabr/feature-Composer2

The 'composer install' command is added to fix the travis build