* Added new classes with behavior from MetadataManager & MetadataSource
* Replaced MetadataManager usages with new classes
* New PrefixDataIOHandler which packs data into a jar
* Added mockito-core jar to lib folder
* Added mockito-all jar to lib folder and updated tests to not use junit4 annotations
* Fixed prefix generation entry points
* Specific exception for missing metadata cases
* Small change in checking missing metadata cases
Update doc references to refer to CLDR and the page of CLDR codes where
appropriate - it used to say ISO country codes were used, but they aren't.
Also updated to refer to two *or three* letter language codes since they may be three letters (we use the shortest defined one for a language)
Updating comments about leadingDigits field at territory level as well.
- LOGGER -> logger
- Small comment fixes
- Style-guide-recommended formatting changes
- Removal of duplicate, unneeded method in PhoneNumberToTimeZonesMapper.java for canBeGeocoded, using phoneNumberUtil instead.