Manually restoring modified file back to saved state requires save

[vsccarl]

• VSCode Version: 1.0.1-alpha
• OS Version: Windows 10 / Ubuntu 15.10

Steps to Reproduce:

1. Open a file with some code and save. For example

var test = "test"

1. Delete and re-type "test"

Actual:
Even though the file is restored back to its saved state, it still requires a save. This is the same behavior as VS Full, but Atom supports remembering the saved state and does not require save if the file is restored to the saved state.

[bpasero]

#919