Branding consistency fixup

[IgorMinar]

Please search (case insensitive) and replace within md files in this repo as follows:

angular (1\.\d) -> AngularJS $1
angular 1\.x -> AngularJS
angular 1 -> AngularJS
angular1 -> AngularJS

angular 2\.0 -> Angular
angular 2 -> Angular
angular 2\.x -> Angular
angular2 -> Angular

[IgorMinar]

Please also reflect these changes on material.angularjs.org. Thanks!

[jelbourn]

@EladBezalel can you tackle this? Igor wants it done yesterday 😈

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