Link to Martini

Linked to main project in README.
Merge pull request #109 from pengwynn/patch-1

Link to Martini
README for sessionauth now includes full User interface

restored original indentation

Restored 4space tabs to all code samples
Merge pull request #113 from fmd/readme-interface-fixes

README for sessionauth now includes full User interface
+ make Binding return 422 instead of 400 on well formed requests with validation errors. Distinguish between multipart and url encoded forms in order to be able to revoke badly formed multipart requests
Add utf-8 charset to example
Merge pull request #119 from regadas/master

Add utf-8 charset to example
- unused constant, leftover of experimental URL form validation implementation
Renaming Opts to Options for consistency.
Merge branch 'cors' of github.com:rakyll/martini-contrib into rakyll-cors
Merge branch 'status_codes' of github.com:beatrichartz/martini-contrib into beatrichartz-status_codes
Merge branch 'master' of github.com:codegangsta/martini-contrib into cors
Adding cors middleware to the main README.