Editor Support, System lib sections. Repo link fix

- Fix link to CloudKit-To-Do-List repo
- Spelling fix
- Remove Extras section which had Vim related project and move it to an Editor
  Support section with additional projects
    - vim-swift
    - vim-polyglot
- Add section for System libs
    - swift-smc
Merge pull request #14 from beltex/updates

New lib sections. Repo link fix.