feat(rxFeedbackSvc): added ability to customize e-mail; Fix #546
style(rxApp): Change colors for pre-prod menu

Closes #538
feat(Environment): Better ways to check for a valid environment

This addes the following methods to Environment:

  * isPreProd
  * isLocal
  * isUnifiedPreProd
  * isUnified
  * isUnifiedProd

For instance, rather than calling `'local' === Environment.get().name`
you can just do `Environment.isLocal()`
chore(rxApp): Put preprod colours into variables
test(rxModalForm): Use `submitText` and `cancelText` in our demo page

We weren't testing that `submitText` or `cancelText` work on the
`rxModalForm`. This changes the demo page to use both of them, and
adds midway tests to confirm.
chore(version): v1.2.0 [skip ci]
feat(tooltips): Add tooltip directive

Closes #552