CB-5990 Delete unused findPlugins() function
CB-5017 accept proxy config for plugman

plugman does not honor proxy configuration. take the same apporach as
npm itself and use "request" module to handle proxy config.

this commit also introduces changes to dependencies:
 + request
 + tar
 - tar.gz
Print out only the version number for `plugman --version`

Merged from https://github.com/apache/cordova-plugman/pull/43
CB-4886 Initial addition of "plugman create"
CB-4886 Minor tweaks to Android & iOS plugman create templates.
CB-6025 ios: Do not add static libraries (.a) to source files
Remove temporary log messages
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cordova-plugman