Fixes issue #5

see: https://github.com/weworkweplay/ProcessJSONInstaller/issues/5
Fixes minor assumptions
Introduces json dependencies

pretty alpha at the moment
Adds functionality to uninstall dependencies

Including PW module dependencies and JSON dependencies. JSON
Dependencies are scanned recursivly
Merge branch 'json-dependencies' of https://github.com/owzim/ProcessJSONInstaller into json-dependencies

Conflicts:
	classes/Dependency.php
	modules/simple-page.json
	templates/install.php