docs(CHANGELOG.md): add changelog for v1.3.0-beta.18 and v1.2.22

Closes #8581
docs(CHANGELOG.md): fix typo, it's 1.2.22 not 1.2.2!

Whoops!
chore(doc-gen): move e2e tests into docs folder

These tests didn't really fit in the test folder as the docs app is mostly
a separate entity from the AngularJS codebase.
docs(guide/e2e-testing): correct link to protractor's getting started

angular/protractor@fcd973b#diff-f3b56000093113bd3bfb6c9c05e7e945 splits the overview doc into
multiple files, and removes overview.md from the repository entirely, making the current link a 404.

This CL points the link to the new getting-started document rather than the overview, and avoids
linking to a missing document.

Closes #8595
feat(ngRoute): add method for changing url params

Add a $route#updateParams method for changing the current route
parameters without having to build a URL and call $location#path.
Useful for apps with a structure involving programmatically moving
between pages on the current route, but with different :param
values.

Properties in the object passed to $route.updateParams() will be
added to the location as queryParams if not contained within the
route's path definition.
perf(benchpress): add benchpress node module and port over large table test
docs(benchpress): add readme with instructions on using benchpress
feat(benchpress): configure benchpress grunt task
fix(jQuery): cooperate with other libraries monkey-patching jQuery.cleanData

Some libraries (like jQuery UI) patch jQuery.cleanData as well. This commit
makes Angular work correctly even if such external patching was done after
the Angular one.

Fixes #8471
feat(jqLite): implement the `detach` method

Closes #5461
chore(docs): update to dgeni-0.4.0