Fix url encoding issue in android 4.4

https://github.com/cobaltians/cobalt/issues/13
Merging with seb's work

Conflicts:

samples/CatalogApp/Android/CobaltCatalog/src/fr/cobaltians/cobaltcatalog
/fragments/CallbacksFragment.java

samples/CatalogApp/Android/CobaltCatalog/src/fr/cobaltians/cobaltcatalog
/fragments/SimpleHybridFragment.java