Helper.getWegasProperty

read a property in 1 wegas-override.properties or  2 wegas.properties
*Some more tests on Helper
Merge branch 'master' of github.com:Heigvd/Wegas

# By Benjamin Gerber (2) and Francois-Xavier Aeberhard (2)
# Via Benjamin Gerber (3) and Francois-Xavier Aeberhard (1)
* 'master' of github.com:Heigvd/Wegas:
  comments some js fils (wegas widget in wegas-app)
  Added custom site template
  Fix #157
  Add some comments on wegas widgets