Drop testing against Ruby 1.9.2
Revert "Use Ruby 2.0.0 by default"

This reverts commit d03907832d06104ddfeb1ac0b9c53cf69567bf82.
Revert "Add testing for Ruby 2.0.0"

This reverts commit b4d048d6fe545764bb4d881cfb26a791b865bd4f.

Conflicts:
	.travis.yml
Add bootstrap script
Update README