Add type="url" and type="email" into the validators pipeline

[matsko]

No description provided.

[Narretz]

In this commit (which is part of an equivalent pull), there's an additional test that checks if required is set when another validator is false. Might be worthwhile to add it: https://github.com/swisstofu/angular.js/commit/04c26bb1e59c0f9329a7a9ab1157a08475bc4fb3

[IgorMinar]

lgtm. the second commit also closes #7849.

#7868 is a dupe of this PR but is not rebased correctly, so it should be easier to get this one in instead. The test that @Narretz mentioned is also part of that PR.

[IgorMinar]

merged