2.0.0

- [x] - #28 - Add option specifying how frequently to check if items have expired (performance)
- [x] - #30 - Third option to aggressive and passive delete. 
- [x] - #42 - Namespace the module
- [x] - #45 - Refactor AngularCacheFactory#info() to return info like AngularCache#info()
- [x] - #46 - Refactor the way a cache's options are set internally to be less convoluted
- [x] - #47 - Feature delete on expire
- [x] - #52 - cacheFlushInterval doesn't clear web storage when storageMode is used.
- [x] - #53 - AngularCache#info(key) should return 'undefined' if the key isn't in the cache
- [x] - #54 - 1.2.1 (2.0.0 bug fixes)
- [x] - #55 - Add ability to set global cache defaults in $angularCacheFactoryProvider
- [x] - #56 - Re-write README documentation to be clearer and more organized.
- [x] - #57 - feature-heap-delete
- [x] - #58 - Re-write all units tests
- [x] - #59 - README has incorrect examples of time spans