refactor(*): removing unused vars

Close #9710
fix(templateRequest): allow empty html template

allow empty html template and not throw error

Closes #9581
docs(guide/bootstrap): close script tag

Closes #9739
docs($templateCache): clarify inline template

Current doc doesn't state required tag location clear enough. It was
[stack overflow|http://stackoverflow.com/a/16125138] where I've found that requirement

Closes #9741
docs(form.FormController): add date parse error tokens to FormController.$error

☆.。.：・゜☆  Closes #9743 ☆.。.：・゜☆
docs(guide/expressions): add commas to run-on sentences to make them clearer

Closes #9738
docs($http): document $httpProvider.interceptors in $httpProvider documentation

☆.。.：・゜☆ HASHBANG #NGEUROPE ☆.。.：・゜☆

Fixes #9366
Closes #9728
fix($observe): check if the attribute is undefined

Check if the attribute is undefined before manually applying the function because if not an
undefined property is added to the scope of the form controller when the input control does not
have a name.

Closes #9707
Closes #9720
refactor(Angular) use Object.keys instead of manually constructing array

Shrink dat coed ;u

Closes #9704
docs(tutorial/tutorial): instructions to install `npm` on debian

Additional package required for a Debian install

Closes #9749
feat($compile): allow $watchCollection to be used in bi-directional bindings

an asterisk can be specified in the binding definition to use $watchCollection instead of $watch.
e.g. scope: { prop: '=*' }