Updated invoice.payment_succeeded mock
Updated invoice.created, invoice.updated to latest API version
Add global_id_prefix

Allows for removal of `test_` from the begining of generated ids.  This
makes StripeMock act more like Stripe if need be.
Add failing tests for global_id_prefix [#73]
Improve global id prefix specs [#73]
passing specs for local, now onto StripeMock::Server...
global_id_prefix working for StripeMock::Server
Refactor & cleanup
Document new global id prefix feature
Version bump to 1.10.1.3
Support passing card tokens to new charges
Version bump to 1.10.1.4
Updated invoice.payment_failed.json to match currect format
Merge pull request #76 from gyardley/cleanup

Updated invoice webhook events
Fixed customer.subscriptions.all
Merge pull request #77 from gyardley/subfix

Fixed error on customer.subscriptions.all [Fixes #75]
Version bump to 1.10.1.5
Supports trial_end param in customer create, subscription create and update
Minor refactor
Handle quantity and application_fee_percent [Fixes #80]