Add another Android < 4.4 UXSS exploit.
Remove stray alert() for debugging.
Update descriptions to mention Webview bugginess.
Add tnftp_savefile exploit

Also add URI{HOST,PORT} and {,v}print_good to HttpServer.
Finally write a decent description
Handle invalid JSON errors and fix typo.
Remove 2.0 Travis testing

Fixes #4125
Land #4109, tnftp savefile exploit from @wvu-r7
Land #4015, another Android < 4.4 UXSS module
Land #4126, rm Travis testing for 2.0