gwt-mockito brings gwt-dev 2.6 dependency. Fixing it to use 2.5.1
missing .gitignore on uberfire-security/uberfire-security-server/
UserManagementServiceImpl default constructor required by weld
super-dev mode linker seems not to work with cross-site scripting (showdown.js from widgets) - further info on uf-19
Merge pull request #65 from ederign/0.5.x

Small fixes in order to run showcase on this 0.5.x