Update blankslate.rb to play nicer in Ruby 1.9

Currently, blankslate causes bugs and quirks since `instance_methods` 
returns symbols on Ruby 1.9.  This patch fixes that.
Make it 1.8 compatible and slightly faster
Kill the whitespace
Merge pull request #6 from github/fix-builder-19-issue

Update blankslate.rb to play nicer in Ruby 1.9
Don't ever undefine object_id
fix respond_to? bug on ruby 2.0
establish a baseline by skipping all tests failing before 2.0.0
fix some AR tests on 1.9
fix invalid YAML
fix AR tests
add cibuild script and Gemfile.sh
exit with failure status if tests fail
god damn rbenv
sigh
whoops
install sqlite3
don't run AR tests for non-sqlite3
remove obsoleted usage of URI.unescape
install rack too
install erubis