Update setup dependencies
Update setup dependencies

- Moved selenium dependency to tests_require (no need to install for
  default)
- Updated pymongo version to 3.2.1 so that we can use new mongo

picoCTF/picoCTF,picoCTF/picoCTF,royragsdale/picoCTF,royragsdale/picoCTF,royragsdale/picoCTF,royragsdale/picoCTF,royragsdale/picoCTF,royragsdale/picoCTF,picoCTF/picoCTF,picoCTF/picoCTF,picoCTF/picoCTF,picoCTF/picoCTF,royragsdale/picoCTF