windows git bash Ctrl-C doesn't terminate process

[gregvis]

• VSCode Version: 1.7.1
• OS Version: Windows 8.1

Steps to Reproduce:

1. "terminal.integrated.shell.windows": "C:\Program Files\Git\bin\bash.exe"
2. Ctrl-C doesn't work for terminating a process (such as cordova run).

[Tyriar]

Moved upstream https://github.com/Tyriar/pty.js/issues/7