Pylint complains if you use string, even if you use it for what its still meant to be used for.
Change wildcard imports into specific imports
Tweaks to our pylintrc rules.
Fix all W0602, global used but no assignment done.
Remove obsolete file comment_client/legacy.py
Files that may not exist need F0401 suppressed during import.
Merge pull request #251 from edx/ned/pylint-fixes

Ned/pylint fixes