Fixing style and syntax errors
Added vtkweb source files to style tests
Replaced pep8 with flake8 and fixed linting errors
Removing unneeded file specifier (covered by previous line)
Merge branch 'develop' into use-flake8
Don't split long string
Adding JS files to style testing.  Lots of style fixes.
Merge pull request #448 from Kitware/use-flake8

Use flake8 instead of pep8