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Release version 0.5 as Beta. Main changes from last release are as below:
1. Fixed issues on navigation and frame javascript execution context.
2. Added optional 'promptText' parameter to DevTools Page.handleJavaScriptDialog.
3. Added command implicitlyWait. 
4. Made session commands run in separate session threads.

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/12703023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@190486 0039d316-1c4b-4281-b951-d872f2087c98