Can't Edit Renamed Files

This bug seems to impact all files which were renamed in git.

Repro Steps:
1. in an empty directory, gitit --print-default-config > my.conf
2. Edit my.conf, change require-authentication to "none"
3. run: gitit -f my.conf
4. in the wikidata directory, echo "test" > Foo.page
5. git add Foo.page && git commit -a -m"test1"
6. git mv Foo.page Bar.page && git commit -a -m"test2"
7. Go to the Bar page, and click "edit"

Expected: You are able to edit the file
Actual:

```
Happstack 7.3.7

Something went wrong here
Internal server error
Everything has stopped

The error was "UnknownError: parseChanges encountered odd number of fields"
```