- Linting (ESLint): Ignore releases (Fixes #387)

- npm: Ignore `releases`, `gh-disabled-workflows`, `.travis.yml`
- npm: Change `open-tests` script to run `instrument`
- Docs: Clarifications on testing

.npmignore

@@ -2,8 +2,10 @@ ignore
 screencasts
 
 .github/ISSUE_TEMPLATE/bug_report.md
+gh-disabled-workflows
 build
 lgtm.yml
+.travis.yml
 
 cypress/**
 cypress.env.json
@@ -13,3 +15,5 @@ coverage/**
 instrumented/**
 mochawesome-report/**
 mochawesome.json
+
+releases