Revert "Add specific script/install to travis as an attempt to fix 1.8.7 build failure"

This reverts commit a345d4e0cd62020c1893f720ba743efcee2af50b.

Conflicts:
	.travis.yml

Reason: travis Ruby build has been updated with a fix for 1.8.7 + rake.
https://github.com/travis-ci/travis-ci/issues/2253#issuecomment-42264423