WL-163-added-the-USD-symbol-himBHin-the-HTML-templates-configuration-settings

added the unit tests for the default currency settings
Merge pull request #6068 from edx/muhhshoaib/WL-163

The USD symbol $ is hard coded into the HTML templates
fix broken master regarding pep8 number of blank lines
Merge pull request #6089 from edx/cdodge/pep8-fixes

fix broken master regarding pep8 number of blank lines
Clean up all modulestore testcases

fix pep8 and pylint violations

Move modulestore config for tests to an importable location
Disable pylnt warning for lms imports in common tests
Refactor all testcases that loaded all xml courses