Removing BrowserStack creds form travis.yml

And adding them in travis settings

Author: raghuhit

.travis.yml

@@ -17,6 +17,4 @@ matrix:
     - os: osx
       ruby: 1.9.3
 
-before_install:
-  - true && `base64 --decode <<< ZXhwb3J0IEJST1dTRVJTVEFDS19BQ0NFU1NfS0VZPUh5VmZydXJvb3dYb041eGhLZEs2Cg==`