Added methods to set baseUri from the RequestSpecBuilder and RequestSpecification classes.

Signed-off-by: DeviKiran <devikiran.setty@happiestminds.com>
Modified UnitTest mergeRequestSpecsOveridebaseUri

Signed-off-by: DeviKiran <devikiran.setty@happiestminds.com>
Changed the method name to camel case "setBaseUri"
Merge pull request #20 from devikiran/master

Added methods to set baseUri from the RequestSpecBuilder & RequestSpecification classes