create changelog

CHANGELOG.md

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+<a name="2.0.0-alpha.41"></a>
+# 2.0.0-alpha.41 (2015-12-8)
+
+
+### Breaking Changes
+
+#### CSS Refactor
+
+* Attributes are now used by Ionic to add the correct CSS classes to elements
+* Drastically reduced the depth of CSS selectors
+* Further modularized Sass files to allow individual imports
+* Ionic CSS comes in 3 flavors
+    * `ionic.css`: Core CSS, iOS CSS, and Material Design CSS
+    * `ionic.ios.css`: Core CSS and iOS CSS
+    * `ionic.md.css`: Core CSS and Material Design CSS
+* App's `index.html` file can be setup to dynamically load only the stylesheet it needs
+* Different Sass color maps for iOS and Material Design
+    * Allows colors to be different per platform
+    * ie: Gray navbars in iOS, blue navbars in MD. Identical HTML/JS
+
+
+####  `<ion-nav-items>` renamed to `<ion-buttons>`
+
+* `primary` attribute `<ion-nav-items primary>` now `<ion-buttons start>`
+* `secondary` attribute `<ion-nav-items secondary>` now `<ion-buttons end>`