[CB-3310] add default textbox for notification prompt

- added defaultText parameter to notification prompt
- updated prompt testcases
[all] [CB-3029] Fix non-CLI start-up when served over http.
CB-3327: Allow Logger plugin to log to both console and native
[all] Removed output date stamp as it an un-necessary change to the output files. commitId is plenty of info.
[windowsphone] removed unneeded platform override for notification.alert/confirm
[windowsphone] removed unneeded clobbers in File api