Remove dynamic bits from Gemfile, add Gemfile.lock

- Travis no longer has a problem with rcov/simplecov
- We can put ruby-debug/debugger in the development group, and exclude
  that from being installed on CI
Remove errant theme file
Move utility script into the util directory
Add additional utility scripts

- generate a weighted random seed schedule
- submit session to lanyrd
- transfer schedule items from a previous event
- update proposal status in bulk based on lists of IDs