pyflakes: add page

Implemented from commit f1daa84

pages/common/pyflakes.md

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+# pyflakes
+
+> Pyflakes checks Python source code files for errors.
+
+- Check a single Python file: 
+
+`pyflakes check {{path/to/python_file}}`
+
+- Check Python files in path:
+
+`pyflakes checkPath {{path/to/check}}`
+
+- Check python files in a directory recursively:
+
+`pyflakes checkRecursive {{path/to/directory}}`
+
+- Check all Python files found in multiple paths:
+
+`pyflakes iterSourceCode {{path/to/check}} {{/another/path/to/check}}`