Fixes security risk where user submitted data could be modified during the payment process

This fix adds memory based sessions to remember user submitted data across requests. Note that for setups that deal with many requests it is advisable to use external session storage.

Stripe integration updated to be compliant with new EU SCA regulation

Merge pull request #5 from mjgs/update-modules

Update modules

Introduces vhost support

Ability to add static and dynamic apps and associate domains name to the apps.