added bigint for ID columns

[ConSou]

attempts to resolves issue #479

[ConSou]

Hello, I'm not entirely sure what is causing all of the Bundler could not find compatible versions for gem "bundler": errors. I see gemfiles/rails42.gemfile is the file that is causing all of the failures and the travis cl job log seems to point to the rails version not having the correct bundler version. I'd love to fix this, but not sure where to start. Any thoughts or advice? Thanks!

[danielmorrison]

Cool, i'll take a look deeper later in the week if nobody else does first.

One thing we'll need to add is another migration for existing users.