Add Travis-CI

-setup travis yaml file
-update readme.md with travis build badges

Squashed commit of the following:

commit 166516dc9e6340e332a7fd1ef3868614d6ba7a78
Author: Nikola Savic <NikolaSavic@gmail.com>
Date:   Fri Apr 25 15:56:57 2014 -0400

    Update readme.md

commit 5fc62c1b1a21b15141336095c328d8706f064f94
Author: Nikola Savic <NikolaSavic@gmail.com>
Date:   Fri Apr 25 14:23:49 2014 -0400

    Remove support for ruby 1.9.3 in travis yml

commit a8d4cae840e63817a8ff70d7e6dcc2fecfd3feba
Author: Nikola Savic <NikolaSavic@gmail.com>
Date:   Fri Apr 25 14:18:21 2014 -0400

    Add Travis-ci setup yaml