Merge pull request #328 from maudineormsby/master

Find Element from Element in webviews + test
enable getting of text in webview alert
allow dismissing of alerts that only have OK buttons
allow setting of alert text
make sure setAlertText fails on non-prompts
make sure you can't get text of a dismissed alert
betterify alert closing wait logic
Merge pull request #329 from jlipps/master

even moar alert awesomeness
add frame guineas and ability of executeAtom to run in frame context
allow pre-launching local zips/apps/safari from command line
make sure server quits if it's pre-launch and doesn't work
bump safari default version to 6.1
scope all atom commands to some window object
don't use frame(null) for clearing webview, use mobile: leaveWebView
basic web frame setting and tests
allow switching back to default frame
add tests for iframe switching too
better error handling and clear out webframe on new url
add ability to switch to frame by element
allow finding frames within frames