* [ci][ftr][kbn/test] split up CI jobs
* [ci] run --assert-none-excluded in ci groups, before builds
* [ftr] improve error message when excluded tests found
* [ci] document other places the ciGroups live
In order to make the license that applies to each file as clear as possible, and to be consistent with elasticsearch, we are adding Apache 2.0 license headers to the top of each file.
Existence of this header is enforced by eslint and tslint and missing headers were automatically added in the last commit by running:
```
node scripts/eslint --fix && node scripts/tslint --fix
```
* get wiring done for timelion application functional tests
* add tests for expression type ahead functions, arguments, and argument values
* provide argument suggestions when argument name not provided
* updates from cjcenizal review
