Revert "Support for Genymotion AVDs."

This reverts commit 646a11f93960edaf3be4ca81bb297727cae47d13.
Added genymotion avd support.  Avds are added to android avd combo box. Support for launching genymotion avds will be introduced in appium 1.1.
Merge pull request #298 from jamescaldwell/master

Added genymotion avd support