File handle is not disposed when closing a file

[blake-mealey]

The file handle is not currently cleared from the ApiSpecFile service which can result in unexpected behaviour:

1. Open a file in Chrome
2. Close the file
3. Create a new spec

The save buttons are the new version (Save and Save As...), and clicking on Save will save back to the file you opened in step 1.

Fix: clear the file handle from the ApiSpecFile service when the file is closed.