Add http patch request for api
replace class potentially representing patch option performed on resources
document join_url_params
one line comment
Add Billing Plan and Billing Agreement for subscription payments for REST APIs, add patch support and update init
Add samples for all billing plan and agreement endpoints and add tests
Update readme with subscription instructions
Update subscription README
Update version to 1.2.0
Update for python 3.4 support, read license if available
Correct tests for billing plans and agreements
Make Post url more configurable in resource class, use Post class for billing agreement execution and add docs for execute and search_transactions
Update billing plan create attributes
pep8ify
Change search transactions from taking dictionary to start and end date as parameters
Change execute of billing agreement to be a classmethod since at the time of invocation, no instance and hence agreement id will not be available, only the token
update billing plan json example
Merge branch 'subscription_apis'

Merge in subscription apis integration, tests and samples into master