Pull PascalCaseToSnakeCase into the util package.
Only replace \r if it's followed by \n when creating a diff.
Add some Diff tests.

Diff only adds context to the beginning of each change, not the end.
It also doesn't insert a divider between different diffs.
Print the diff out in the tests.
Add some more diff tests.
Add context to the beginning and the end of the diff.
Merge pull request #354 from erbridge/util_case

Pull PascalCaseToSnakeCase into the util package
Remove duplicate import.
Add empty test files to packages wihtout any tests.

This is so they get included in the coverage reports.
Add empty frontend tests too.
Fix a spelling error.
Merge pull request #355 from erbridge/diff_test

Make a util.Diff add context before and after the diff