Extended ENML conversion and resource support (BREAKING CHANGES)

- ENML conversion now moved to clojurenote.enml namespace
- Old 'remove-enml' and 'plain-content' functions replaced by
  enml/enml->html (documentation to come later)
- notes/resource->bean-with-body-hash-hex will add hash hex's that
  can be mapped to hash's in ENML
- Various notes/*-url functions to facilitate downloading resources
  from Evernote servers directly
- users/get-public-user-info-* functions for getting PublicUserInfo
  objects
Merge branch 'master' of github.com:mikebroberts/clojurenote