Version bump to 0.8.8.pre
Security Fix: Updated Rails to 3.2.12
Setup Travis-CI to test against Ruby 2.0.0
Updated Contour to 1.1.3
ActionMailer can now be configured to use the NTLM protocol used by Microsoft Exchange Server
Updated README and CHANGELOG to Markdown format
Ruby 2.0.0 compatible!

Removing allow_failures for Ruby 2.0.0, and will maintain Ruby 2.0.0 compatibility going forward
Version 0.8.8 finalized