* Update eslint related packages
* add errorMessage to no-restricted-paths validation
* add license to eslintrc file
* ignore broken plugin fixture
* upgrade tangled peer deps
* give name to unnamed func to avoid typescript-eslint/typescript-eslint#1078
* migrate away from removed prefer-interface
* migrate away from removed no-angle-bracket-type-assertions rule
* migrate away from removed no-triple-slash-reference rule
* old config was invalid and made this rule a noop
* fix array-type rule config
* fix readonly paramProperties that weren't being checked
* fix propType ordering
* remove references to non-existent rules
* remove unnecessary disable that is improperly formatted
* fix comment-related spacing
* fix typo/invalid namespace overrides
* rename fn to avoid hook-alike behavior
* remove reference to old removed rule
* use caret version for prettier
* reference babel-eslint with absolute path
* [mocha] fix test selectors to get everything in packages
* fix paths in tests
* ignore test files that make it into target directories
* [@kbn/test] don't build test files
* move tests from datemath and test-subj pkgs into __tests__ dirs
* [kbn/test-subj] remove test script
* update yarn.lock
* [@kbn/expect] "fork" expect.js into repo
* [eslint] autofix references to expect.js
* [tslint] autofix all expect.js imports
* now that expect.js is in strict mode, avoid reassigning fn.length
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
```
* Add test-subj-selector module to packages dir.
* Rename to @kbn/test-subj-selector.
* Simplify rejectRejFiles Grunt task and ignore nested node_modules.
* Update jenkins_unit script to use yarn kbn CLI.
