Proxy and HTTP over HTTPS

Added ability for the android binary to be called with additional
parameters to use http proxies or to force HTTP connection over HTTPS

Proxy is passed using system variables 'http.proxyHost' and 'http.proxyPort' as well as forcing HTTP over HTTPS is passed via 'android.preferHttp' variable.

Actually I'm not quite sure about my implementation of the part where array is filled with parameters.