AngularJS 1.3.1 发布，下载地址：v1.3.1.zip
新版本改进记录包括：
Bug Fixes$compile: returning null when an optional controller is not found
(2cd5b4ec,#9404, #9392) $observe: check if the attribute is undefined
(531a8de7,#9707, #9720) $parse: support dirty-checking objects with null prototype
(28661d1a,#9568) $sce: use msie instead of $document[0].documentMode
(45252c3a,#9661) $templateRequest: ignore JSON Content-Type header and content
(1bd473eb,#5756, #9619) i18n: rename datetimeSymbols to be camelCase
(94f5a285) loader: fix double spaces
(8b2f1a47,#9630) ngMock: $httpBackend should match data containing Date objects correctly
(1025f6eb,#5127) ngSanitize: attribute name: xmlns:href -> xlink:href
(4cccf0f2,#9769) select: assign result of track exp to element value
(4b4098bf,#9718, #9592) templateRequest: allow empty html template
(52ceec22,#9581) testability: escape regex chars in findBindings if using exactMatch(02aa4f4b,#9595, #9600)
Features$compile: allow $watchCollection to be used in bi-directional bindings
(40bbc981,#9725) ngSanitize: accept SVG elements and attributes
(a54b25d7,#9578, #9751)
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