Semi major update
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- Add Support for multiple back-end key trackers Apc, Memcache, InMemory, Memcached
- Added Configuration class for Dependency Injection and eliminated hard requirement on pimple. (Need to actually remove pimple next and disable backwards compatability mode)
- Added Constant Tag for invariant tags-instances that you still wish to include in your keys for logical/presentional reasons.
- Updated Test coverage to verify that mixed mode Apc + Memcache works as expected
- Updated Test Coverage to verify that constat keys work as expected.

@Todo
- Add test coverage for in-memory cachehanlder
- Add add KeyRing manager class to allow a comlex application to quickly define a key structure with out needing to in code create multiple tags.
- Add auto tags (ability to include naked strings inplace of tag standard when adding tags or instiating key).