Update Travis settings for Rubinius

/cc @brixen
Merge pull request #42 from jaakko-sf/master

Fix for issue #41
Merge pull request #43 from jaakko-sf/master

bump version number
Added --raw-data to send pre-URL-encode data as is

presumably fixes #33
CGI::parse() returns hash of arrays, but we need a string
Tests to cover --raw-data, which should fix #33
Merge pull request #44 from sanmai/patch-1

Added --raw-data to send pre-URL-encoded data as is
Fixed the URL to register new Twitter apps

It has moved to https://apps.twitter.com/app/new.
Fixed a typo.

Changed "beauthorized" to "be authorized" on line 32.
Merge pull request #46 from qw3rtman/master

Fixed a typo.
Lock rest-client to ~> 1.6.0 on Ruby 1.8.7
Require Ruby 1.9.3 or higher
Flip secret bit to enable Docker builds
add twurl version to user agent header