Update future payments sample with api object
Merge branch 'master' into stable

Merge future payment sample update
Update keywords and dl
Python 3.4 for travis
Merge branch 'master' into stable

Update for 3.4 and setup
Add existing issues message
Add developer website link
Merge branch 'master' into stable

Merge in README doc updates
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