mailchimp 7.x-2.0-alpha1

First release of the new 7.x-2.x branch, which is a complete rewrite featuring a new module architecture allowing for general API usage and submodules for specific uses cases, performance improvements, and new features. Leverages Entity API and core entities for creating and managing lists and users, caches all data from the MC API, and uses the batch API for async list management.

This first release pull out all the API integration and core features into mailchimp.module and allows for Drupal user and MC list synchronization through mailchimp_lists.module. The list management page is also completely revamped.

IMPORTANT note: This module is not backwards compatible with previous versions and there is no upgrade path at this time.

Roadmap for a full 7.x-2.0 release:
- Integration with MailChimp's web hook system to update a users status in Drupal.
- MailChimp STS integration.
- Anonymous subscription forms (maybe)