make rubyversion rbenv and rvm compatible

Also bump to latest 1.9.3
Remove Gemfile.lock file
Instrument sqlite3 instead of sqlite
Merge pull request #25 from arthurnn/ruby_version

make rubyversion rbenv and rvm compatible
Merge pull request #26 from arthurnn/remove_lock

Remove Gemfile.lock file
Merge pull request #27 from arthurnn/sqlite3

Instrument sqlite3 instead of sqlite