init
check for valid url
removed Key interface
refactoed keys to inherit from an abstract key class
created tests for key files
updated keys, fixed Crypter class and created tests
use getFormattedKey instead of using __toString
added mockery for dev
using mocked key classes
invalid crypting operation test
implemented Cryptable interface for the process method
Response class to handle response data
implemented constructor
added recipt attributes with getters/setters
implemented validate method
tests for Receipt and response
fix, endpoint getter
implemented getInvoiceForm
moved phpunit configuration to root
added travis ci configuration
Merge branch 'master' of github.com:sahanh/EZCash