#UDPATE: Follow AndroidStringResourcesGenerator's updates.
#UPDATE: Update the JSON source format.
#UPDATE: Add some test resources into unitest/unitestLibs/Constants.java.
#UPDATE: JsonStringResourcesProvider_Private_SaveJs2AsStringsTest.java.
#UPDATE: Update JsonStringResourcesProvider.java for the change of the JSON source format and minor bugs fixing.
#ADD: Add some unit tests on the class JsonStringResourcesProvider's private methods.