eliminating the list of known headers
removing known headers
and the unapply method. since it's not used right now
Removing Options from HTTPHeader initializers
Merge pull request #14 from stackmob/headers

Removing Known Headers list
this should increase performance by eliminating the existing headers lookup
increasing snapshot patch version
adding contributors
Merge branch 'master' of github.com:stackmob/scalamachine
Merge branch 'master' into reqrespdata