Fixed typo in Transaction entity
Added token account implementation
Removed TokenAccount entity in favor of new fields on all account entities
Added account tokenizer interface
Fixed typo in AccountTokenizerInterface
Removed broken reference to nonexistent subclass in AbstractAccount
Added TokenizerException class
Added cvv field to account in CardTransactorTest
Added filterResult method to AbstractTransactor
Moved request filtering to CardTransactor
Moved request filtering to AchTransactor
Moved request filtering to PaymentsXpress AchTransactor
Updated composer and added 5.5, 5.6, and hhvm to travis config
Added lastFour attribute to AbstractAccount
Changed lastFour to not be nullable
Fixed Style
Merge pull request #27 from brainwood/AccountLastFour

Added lastFour attribute to AbstractAccount