Update android.html

Make the sdcard path in the text consistent with the screen shot (android-shellwgetmitmproxyca.png).

/sdcard/Download (singular) is the correct path.
Merge pull request #173 from joebowbeer/patch-1

Update android.html
attempt to fix https://github.com/mitmproxy/netlib/issues/24
Merge remote-tracking branch 'origin/master'
Merge branch 'master' into 0.10
Merge branch '0.10' into integrate_honeyproxy
Merge branch 'fix_invalid_tcp_close' into integrate_honeyproxy
fix proxy_config