Update worldpay host URLs.

WorldPay recently communicated that their host URLs are changing.

"If you were previously using RBS WorldPay links such as https://secure.wp3.rbsworldpay.com/wcc/purchase  you will need to ensure that these are replaced with https://secure.worldpay.com/wcc/purchase to ensure that your site continues to be able to send payments through WorldPay's systems."

The documentation currently lists the new URLs

http://www.worldpay.com/support/kb/bg/htmlredirect/rhtml.html

This change updates the URLs as required.
bumped version
Added an extension to allow rendering of integration objects in a Jinja2 template.
Revert "Added an extension to allow rendering of integration objects in a Jinja2 template."

This reverts commit 4bd903e2f531672c930f9ebac44ac1a76ececab0.
Added a whole host of new allowable fields for multiple item processing. Also changed field name matching into a regex for ease of maintenance and efficiency.
Merge pull request #80 from Scotts-Marketplace/multiple-items

Added new allowed fields for posting multiple items to PayPal
Revert "Revert "Added an extension to allow rendering of integration objects in a Jinja2 template.""

This reverts commit 94199d05795323c2747a7ce2e671d92f3c0be91f.
beanstream unuauthorize - use min amount 0.5 instead 0
fix & enable beanstream tests
update settings for beanstream tests
cleanup encrypted settings
Adding pin payments pin.net.au support
updated settings for pin.net gateway
replace simplejson with json
fix duplicate test case

fixes: <PaylaneTransaction: Transaction for ....>, 'error': Error Code:
401 (Multiple same transactions lock triggered.  Wait 7 s and try
again.). Acquirer Error:
Stripe offsite documentation fix
added contributor
Merge pull request #83 from llonchj/stripe_documentation_fix

Stripe documentation fix
Added Pin Payments models and forms
Merge remote-tracking branch 'upstream/master'

Conflicts:
	billing/gateways/pin_gateway.py
	billing/models/__init__.py
	billing/tests/pin_tests.py