Revert "added RoR"

This reverts commit e45143c92cb5c84adc5ccbe56a7a9cedd8dc5ce1.
Revert "Revert "added RoR""

This reverts commit f687890391c51680e1d7fcad5d6cda79f5894b7d.
Revert "Revert "Revert "added RoR"""

This reverts commit d60db7a21db568c934d46ce05972484b93c2d5bb.
remove sqlite3 from gemfile