docs(tutorial): clarify bower usage
style(Angular.js): remove redundant `_angular`

Going through the commit history on GitHub, the `_angular` is for noConflict mode,
the case where you have an old reference to a variable called Angular you want to preserve.

Here is the commit that added _angular in : https://github.com/angular/angular.js/commit/
12ba6cec4fb79521101744e02a7e09f9fbb591c4

This feature was later removed here:
https://github.com/angular/angular.js/commit/9faabd1ba0b1929785bcf166dc0ff60008e7c442

The variable 'made it through', it's redundant now.

Closes #7215
docs(ngMock): fix example for $http respond() helper with function as 1st param

The  `whenPOST` method should return a response object containing status, response body and headers.
If omitted the following error will be thrown:

`Uncaught TypeError: Cannot read property '2' of undefined`

The documentation doesn't make it very clear, so I think it will be appropriate to add it here.

Closes #6761
docs(guide/di): fix typo

Fixed a typo. "depenendencies" -> "dependencies"

Closes #7232
docs(tutorial/step_00): add correct description for attributes naming convention
docs(tutorial/step_09): fix typos

phonecatApp module had a dot instead of semicolon