CB-7190: Add browserify support in cordova-lib/cordova-cli

https://issues.apache.org/jira/browse/CB-7190
again, all of this switching is not required, nor passing the options.browserify property around because plugman.prepare is already dynamic based on the options.

ie.
IF (options.browserify) is TRUE
THEN so is ( plugman.prepare === plugman.prepareBrowserify )