Rename check modules to be more descriptive

[blainemotsinger]

The included check modules are named in an ambiguous way.

For example:

• Whitespace checks for and warns about line ending whitespace. It should be named something like NoLineEndingWhitespace
• IndentSpaces checks for and warns about indent spaces. It should be named something like NoIndentSpaces

Rename the check modules to be more descriptive so the user doesn't have to look up the pod or read the source code to tell what it does.