Added a app INI config file + gulp livereload

* we now have a "config" bootstrap Service, which parses a INI file (since there is no data cache on this file, it's faster to have a INI file to parse than a YAML file)
* in this INI file we put the $app['debug'] setting, DB connection settings & livereload port
* added a simple "livereload" gulpfile
* better DB initialization in "db" Service
* added a livereload script tag when $app['debug'] == true
* bugfix in HooksManager "htmlHooksPriority" setting management