Added get and set_secure_cookie which uses HMAC through OpenSSL crypto lib. Also added some SHA1 utilities. Not done yet.
Read from self.kwargs...
Finalized SHA1 class and added documentation for secure cookies. Also cleaned up cdef.lua.
Merge pull request #99 from kernelsauce/secure-cookiie

Added get and set_secure_cookie which uses HMAC through OpenSSL. Also added bindings to SHA1 from OpenSSL.