Update: Add higher level testfile.

Update: Add higher level testfile.

Previously, something like the following is needed to perform the "remove" program runtime unit tests:
```
fake -w /tmp/fll-0.7/ clean make -f testfile -U build/remove
```

This new `testfile` allows for shortening the command to:
```
fake -w /tmp/fll-0.7/ clean make -f testfile
```

Note tat the `-w /tmp/fll-0.7/` is an example use-case for where I am storing the work directory files.
The command can be simplified to just the following (given a clean source directory and proper system installation of dependencies):
```
fake -f testfile
```