feat($compile): add attribute binding support via ngAttr*

Sometimes is not desirable to use interpolation on attributes because
the user agent parses them before the interpolation takes place. I.e:

<svg>
  <circle cx="{{cx}}" cy="{{cy}}" r="{{r}}"></circle>
</svg>

The snippet throws three browser errors, one for each attribute.

For some attributes, AngularJS fixes that behaviour introducing special
directives like ng-href or ng-src.

This commit is a more general solution that allows prefixing any
attribute with "ng-attr-", "ng:attr:" or "ng_attr_"  so it will
be set only when the binding is done. The prefix is then removed.

Example usage:

<svg>
  <circle ng-attr-cx="{{cx}}" ng-attr-cy="{{cy}}" ng:attr-r="{{r}}"></circle>
</svg>

Closes #1050
Closes #1925
feat($resource): ability to override url in resource actions

Resources now can defined per action url override. The url is treated
as a template rather than a literal string, so fancy interpolations
are possible.

See attached tests for example usage.
feat($route): add `caseInsensitiveMatch` option for url matching

with this property urls can be matched case-insensitively which
enables some new use cases.
feat($compile): support for dynamic template generation

`template` and `templateUrl` properties can now be optionally defined
via a function. This allows templates to be dynamically generated on
the fly.
feat($compile): allow directives to modify interpolated attributes

A directive can now set/update/remove attribute values even those containing
interpolation during the compile phase and have the new value be picked up
during the compilation.

For example in template:

<div replace-directive some-attr-or-directive="{{originalInterpolationValue}}"></div>

the replace-directive can now replace the value of some-attr-or-directive during compilation
which produces this intermitent template:

<div replace-directive some-attr-or-directive="{{replacedInterpolationValue}}"></div>

or even

<div replace-directive some-attr-or-directive="replacedStaticValue"></div>

as well as

<div replace-directive some-attr-or-directive></div>
chore(Grunt): switch from Rake to Grunt

Migrates the Angular project from Rake to Grunt.

Benefits:
- Drops Ruby dependency
- Lowers barrier to entry for contributions from JavaScript ninjas
- Simplifies the Angular project setup and build process
- Adopts industry-standard tools specific to JavaScript projects
- Support building angular.js on Windows platform (really?!? why?!?)

BREAKING CHANGE: Rake is completely replaced by Grunt. Below are the deprecated Rake tasks and their Grunt equivalents:

rake --> grunt
rake package --> grunt package
rake init --> N/A
rake clean --> grunt clean
rake concat_scenario --> grunt build:scenario
rake concat --> grunt build
rake concat_scenario --> grunt build:scenario
rake minify --> grunt minify
rake version --> grunt write:version
rake docs --> grunt docs
rake webserver --> grunt webserver
rake test --> grunt test
rake test:unit --> grunt test:unit
rake test:<jqlite|jquery|modules|e2e> --> grunt test:<jqlite|jquery|modules|end2end|e2e>
rake test[Firefox+Safari] --> grunt test --browsers Firefox,Safari
rake test[Safari] --> grunt test --browsers Safari
rake autotest --> grunt autotest

NOTES:
* For convenience grunt test:e2e starts a webserver for you, while grunt test:end2end doesn't.
  Use grunt test:end2end if you already have the webserver running.
* Removes duplicate entry for Describe.js in the angularScenario section of angularFiles.js
* Updates docs/src/gen-docs.js to use #done intead of the deprecated #end
* Uses grunt-contrib-connect instead of lib/nodeserver (removed)
* Removes nodeserver.sh, travis now uses grunt webserver
* Built and minified files are identical to Rake's output, with the exception of one less
  character for git revisions (using --short) and a couple minor whitespace differences

Closes #199
docs($http): add more info about transform function
chore(Grunt): don't remove root dir from zip
chore(Grunt): include dot files in the final zip
docs(contribute): add note about running command line as admin on win
feat(angular.bootstrap): support deferred bootstrap

This features enables tools like Batarang and test runners to
hook into angular's bootstrap process and sneak in more modules
into the DI registry which can replace or augment DI services for
the purpose of instrumentation or mocking out heavy dependencies.

If window.name contains prefix NG_DEFER_BOOTSTRAP! when
angular.bootstrap is called, the bootstrap process will be paused
until angular.resumeBootstrap is called.

angular.resumeBootstrap takes an optional array of modules that
should be added to the original list of modules that the app was
about to be bootstrapped with.
feat(http): set custom default cache in $http.defaults.cache

When we need more control over http caching, we may want to provide
a custom cache to be used in all http requests by default.

To skip default cache, set {cache: false} in request configuration.
To use other cache, set {cache: cache} as before.

See #2079
docs($resource): Added an installation section.
fix($route): make nextRoute.$route private

the `nextRoute` object available in `$routeChangeStart` handler
accidentaly leaked  property which pointed to the route definition
currently being matched.

this was done just for the internal needs of the `$route` implementation
and was never documented as public api.

Some confusion arouse around why the $route property was not always
available on the `nextRoute` object (see #1907). The right thing for us
to do is to prefix the property with $$ for now and refactor the code
to remove the property completely in the future. Application developers
should use the `nextRoute` object itself rather than its `$route` property.
The main diff is that nextRoute inherits from the object referenced by $route.

BREAKING CHANGE: in $routeChangeStart event, nextRoute.$route property is gone.

Use the nextRoute object instead of nextRoute.$route.

Closes #1907
test($route): add tests for matching 'otherwise' routes
feat(directive): add ngKeypress directive for handling keypress event
docs(directive): minor typo fix

Changed "obeject" to "object"
docs($injector): remove extranneous 'the' from injector docs
chore($ngLocale):  Generate ngLocale files from the Closure code.
docs(ngCloak): update the CSS rule with data-ng-cloak