Rename exercise files to match exercise name

[kytrinyx]

We have a number of exercises that have names that do not match the exercise name.

E.g. the exercise word-count has the file names Phrase.groovy and PhraseSpec.groovy. This means that we cannot generate the correct command to run automatically.

In order to make it possible to generate this, the filenames should be based on the exercise name. So word-count should have the filenames WordCount.groovy and WordCountSpec.groovy.

It would also make sense to update the class names in the exercises to match the filenames.

These are the exercises in question.

• difference-of-squares
• nth-prime
• rna-transcription
• robot-name
• roman-numerals
• word-count

#64 should probably be merged before this issue gets addressed, since it adds more files that need to be renamed to address this issue.

[ilya-khadykin]

Thanks for creating the issue!
I'll fix it later today

[ilya-khadykin]

I've also checked other exercises and found some inconsistency in leap and corrected it as well.

PR #69 has been created.
@kytrinyx, please take a look when you have a minute