change to all camelCase and try even harder in Windows to find bower

echoes #35 but rebased to newest `master`

This pull is designed to make a Windows user's life easier by trying a little harder to find bower in the new addNewWidget set of functions. In Windows, it is conceivable that bower will be installed as needed without the PATH environment variable including its location. I added a new find_bower() function that also looks in the default npm modules directory in Sys.getenv('APPDATA'). While this is not perfect, it might ease the life of a poor Windows user like me who constantly faces PATH issues.

Non-windows users, please test to make sure I did not break functionality for the more sophisticated and wise Apple and Linux users.
Revert the use of `#'` since we don't want Rd files to be built for these. Just use plain comments as before `#`