Update README
Merge branch 'test_improvement'

* test_improvement:
  Update README
  Update README for test
  Add test to check python version
  Remove test runner
  Add Guard file
  Add all test runner for command line. Now every test can be run for commandline
  Change test runner to run test selectively
  Separate test cases
  Fix duplicated test name
  Move test to tests directory
  Give CodeConverter independence from sublime module