Run Protractor/Jasmine e2e tests against multiple versions of Angular by default

[DrewML]

• Now runs tests by default against multiple versions of Angular
• Version config can be updated/edited in test/e2e/angular-versions.conf.js
• Tests can be excluded (or added) per angular version
• Added test and test-max scripts to package.json
  • Running npm test will run tests against all versions, but will cap concurrency to 2 browsers at a time
  • Running npm run test-max will run tests with maximum concurrency
• Removed dependencies not actively being used from package.json
• Broke out the standard e2e spec logic (navigate to page with proper version >> click inspector toggle) into a separate module to prevent duplication across specs
• Fixed a bug where the scenarioServer module wasn't using the port arg
• Moved protractor.conf.js to test/e2e instead of test/, to future-proof folder structure for eventual addition of unit-tests

[DrewML]

Next Plans:

• Move test specs and their scenario templates into grouped folders, rather than having a scenarios and specs folder where files match based on filename.
• Set up Travis CI and SauceLabs to automate testing
• Get a fancy Travis CI Passing/Fail badge on the ng-inspector main repository page :)

Re-ordering of tests and Travis/SauceLabs setup is completed in a separate branch. Just need you to verify this PR, then setup a Travis/SauceLabs account, and we'll be all set :)

[rev087]

Very nice job @DrewML!