AngularJS 1.4.0 RC1 发布

AngularJS 1.4.0.rc1 发布，此版本主要是 bug 修复，详细列表如下：

Bug 修复

$animate:
- ensure that from styles are applied for class-based animations (8f819d2c)
- make sure the JS animation lookup is an object lookup (103a39ca,#11619)
$animateCss: ensure that rAF waiting loop doesn’t ignore pending items during a flush (90e424b2)
$http: stop coercing falsy HTTP request bodies to null / empty body (e04a887c,#11552,#11593)
ngAnimate:
- close parent animations only when there are classes to resolve (1459be17)
- ensure ngClass-based classes are always resolved for CSS-enabled animations (89f081e4)
- do not abort animation if only ng-anchor-in is used (3333a5c3)
- ensure that a filtered-out leave animation always runs its DOM operation (6dd64ab5,#11555)
- ensure that animations work when the app is bootstrapped on the document node (bee14ed1,#11574)
- ensure SVG classes are properly removed (fa0bbded)
ngAria: change accessibility keypress event to use event.which if it is provided (249f9b81,#11340)
ngMessageFormat:
- ensure bindings are valid for Protractor (992114f7,#11644, #11649)
- minified symbol and nested required expression (8a45064f,#11414, #11592)
select: allow empty option to be added dynamically by ng-repeat (abf59c28,#11470,#11512)