Dependencies update

Update configuration for following packages:
  - elpy
  - guru-mode
  - moe-theme

`elpy-clean-modeline` function was removed from Elpy 1.5.0
https://github.com/jorgenschaefer/elpy/blob/860190aa9729a4709c238240bfa1b55df522a2b1/NEWS.rst#new-in-elpy-150

`guru-mode` now replace `turn-on-guru-mode`.

`moe-theme` initialization doesn't use `load-theme`

Github issue: #1