Add simple notifiers
Add tests and improve notifiers
Use adapter in notifiers
Move commands to class constants
Move logos
Addd getter ans setter for resources directory
Move some code to an abstract
Remove getter/setter for directory in favor of getters/setters for images
Rename failure image
Cleaning
Remove useless mocks
Cleaning
Move image file checks
Rework notifiers
Handle exceptions in __toString to avoid errors
Merge pull request #170 from jubianchi/notifiers

Add support for some notifiers (growl, OSX notification center, libnotify), thanks to @jubianchi for its great work!