API client wrapper for /posts/NNN.json
explicit :version param for get_post()
do not include optional params in query string if not provided
include optional params if provided but nil
Merge pull request #51 from jmay/get_post

API client wrapper for /posts/NNN.json
Fix wrong url in update_avatar spec stub request

- updated incorrect url so that the spec would stub correctly
- also added 2nd stub for the put request so that the test wouldn't fail
  when it couldn't find the discourse development server.
Merge pull request #56 from oblakeerickson/fix_update_avatar_spec

Fix wrong url in update_avatar spec stub request
add example for fetching categories and sub-categories
Merge pull request #59 from techAPJ/patch-1

add example for fetching categories and sub-categories
API for posts: edit, wikify
Merge pull request #60 from jmay/wikify-post-squashed

API for posts: edit, wikify