Help porting these changes to the official Sublime Text snippets

[tadast]

I would like to port the snippets in this repo to the official Sublime Rails snippets.

The process should be fairly simple:

• Pick a commit from this repo
• Make an equivalent change on the Rails package in https://github.com/sublimehq/Packages and open a PR following their requirements
• Link your PR in this issue so that others don't duplicate your work

If anyone would like to help me out I would be very thankful.

[tadast]

First PR that fixes the scope miss match of a lot of snippets sublimehq/Packages#906

[tadast]

Update before/after validation on create/update sublimehq/Packages#913

[tadast]

Drop legacy RJS snippets and find(:all/:first) sublimehq/Packages#912