Feature/spread

* Utilize unicode literals module
* Implemented Spreads API
* Corrected path to imported modules
* Added SpreadModel constants
* Included scores api endpoint
* Functional testing for SpreadFactory
* Memcache fetch now returns array
* Implemented SpreadDatastore
* SpreadFactory produces a Spread object
* SpreadMemcache implemented
* SpreadMemcache has fetching capabilities
* Added constant for memcache threshold
* Datablob factory now produces spread data
* Implemented TestData Factory
* Datablob factory now produces spread data
* Updated spread data from string to float
* Implemented functionality for SpreadMemcache
* Base model for spread datastore model