Update the CONTRIBUTING file to give an overview of the new github process.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68472445
Only alter aria-hidden on top-level elements that do not have aria-hidden set
when hiding background elements in ModalPopup.

This fixes an issue where the existing aria-hidden state of top-level elements
was cleared by opening/closing a ModalPopup, and enables the whitelisting of
specific elements using aria-hidden=false.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68489679
Re-enable Cmd+Left/Right for Firefox 29 MacOS as the Firefox bug which caused
erroneous page navigation was fixed.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68530924
Simplify how goog.dom.createDom adds multiple class names to remove the last but one reference to goog.dom.classes.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68537258
Add Chinese comma as address separator when parsing list of email addresses in Closure
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68570362
Turn off goog.Promise.LONG_STACK_TRACES by default, since it is extremely slow in Chrome and newish Chromes now support async stack traces directly in Dev Tools.

I considered several ways how to notify engineers about opting into goog.Promise.LONG_STACK_TRACES upon errors, but none proved to be uninvasive enough for the cases where it is not needed.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68572017
Disable testSavedCaretRange in IE7, because otherwise it would start failing when goog.require('goog.dom.classes') is removed from dom.js.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68622043
Correct goog.ui.PaletteRenderer to update the aria-activedescendant correctly on
highlight being set to false.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68642866
Remove the last use of goog.dom.classes.
Keep the goog.dom -> goog.dom.classes dependency to prevent breaking the tests that use goog.dom.classes but forgot to goog.require it.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68687908
Also turn off long stack traces for deferreds due to performance issues.
See cr/68572017 for the equivalent change in promises.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68703875
Allow configuring a custom error handler in goog.asserts.  This will let
us add debug modes where assertion failures are logged but not thrown.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68720081
Add more info to failure message for easier debugging
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68851662
Fix goog.getMsg with placeholders in values.

This also improves performance from .98s to .54s of the added benchmark in Chrome (and other browsers probably too), mainly thanks to the compile-time construction of the regexp.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68857516
Allow SafeHtml in linkDialog.setEmailWarning.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68858411
Recommend using ChildClass.base instead of goog.base.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68861392
Disallow string in linkDialog.setEmailWarning.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68861676
Add deprecation notice to Closure Builder.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=68919099
Made select.js use the aria role of listbox instead of button.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=69005101
Added a TODO to tighten the type of Event.target, per discussion on cl/68938256 review thread.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=69018419
Automated g4 rollback of changelist 69005101.

*** Reason for rollback ***

Breaks Gmail tests:

*** Original change description ***

Made select.js use the aria role of listbox instead of button.

***
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=69026842