First commit
Add SMTPAPI submodule
Added in CC support and adding HTML and Text Bodies
Add BCC support
Add support for headers
Moved to a SendGrid/Email class model like other libraries
Change post call content type to support attachments later
Started work on CIDs
Support for attachments and CIDs
Add convenience methods for the SMTPAPI header
Started README
Merge remote-tracking branch 'scott/master'