Added the changelog for 1.2.0

CHANGELOG.md

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+1.2.0 / 2014-09-26
+==================
+
+BC break:
+
+* Changed the behavior of `getValue` for checkboxes according to the BC break in Mink 1.6
+
+New features:
+
+* Implemented `getOuterHtml`
+* Added the support of manipulating forms without submit buttons
+* Added support of any request headers instead of supporting only a few hardcoded ones
+* Added support of any BrowserKit client using `filterResponse` when using BrowserKit 2.3+
+* Added the support of reset buttons
+* Implemented `submitForm`
+* Implemented `isSelected`
+
+Bug fixes:
+
+* Fixed the support of options without value attribute in `isSelected` and `getValue`
+* Added the support of radio buttons in `isChecked`
+* Fixed the submission of empty textarea fields
+* Refactored the handling of request headers to ensure they are reset when resetting the driver
+* Fixed the handling of buttons to submit only for submit buttons rather than all buttons
+* Fixed the code to throw exceptions rather than triggering a fatal error for invalid usages of the driver
+* Fixed the removal of cookies
+* Fixed the submission of form fields with same name and without id
+* Fixed `getAttribute` to return `null` for missing attributes rather than an empty string
+
+Testing:
+
+* Updated the testsuite to use the new Mink 1.6 driver testsuite
+* Added testing on HHVM