CB-7707 [android] Added support for multipart plugin result

github: close #83
[all] Don't use "this" in cordova.js (use local reference instead)

Makes the code a bit safer
updated version to 3.7.1, pinned deps
CB-7661 Incremented package version to -dev
CB-2520 - User agent-related changes for custom user agents in iOS

Signed-off-by: Shazron Abdullah <shazron@apache.org>
CB-7735 Fix iOS bridge race condition when using innerHTML on <body>
CB-7816: updated dependencies