Include pushed refs in argument lists for matching methods
Fixes 11 : Check also for pushed ref on matches_branch?
Transform settings methods into intstance ones
Instantiate Settings class
Create Settings initialization method reading from xml file
Move string defaults to getter methods
Handle string to boolean conversion for remaining parameters
Add note on documentation
BUGFIX : never check parameters unles a refspec match is found
Implement plugin descriptor (read-only)
Implement descriptor save operation
Promote into top level the Settings/Descriptor class

Move Settings into GitlabWebHookRootActionDescriptor. Replace uses of the
class with calls to get the plugin descriptor.
BUGFIX : protect against empty configFile
BUGFIX : wrong code to write to file
Implement true booleans for global configuration
BUGFIX : ruby file closing does not give a return code
Improve XML handling
Improve descriptor standarization
Add help files for global configuration
Hide parameters in UI when automatic project creation unchecked