Removed before install, added github package of nycflights13

Author: brnleehng

.travis.yml

@@ -5,16 +5,7 @@ sudo: false
 cache: packages
 warnings_are_errors: false
 
-before_install:
-  - curl -OL http://raw.github.com/craigcitro/r-travis/master/scripts/travis-tool.sh
-  - chmod 755 ./travis-tool.sh
-  - ./travis-tool.sh bootstrap
-
-install:
-  - ./travis-tool.sh install_r nycflights13
-
 r_github_packages:
   - Azure/rAzureBatch
   - jimhester/lintr
-
-
+  - hadley/nycflights13