Replace header logo
Update footer
start file crud docs with creation

This needs updating once we make a decision on how passing
author/committer will work, and probably something better for the
response.
add update-file docs
add delete-file docs

This obviously needs a better response example, if only because the
commit message is about *adding* the readme.
Add OCaml link
Merge pull request #239 from dsheets/patch-2

Add OCaml link
Clarify who can manage repo hooks
Fix docs for editing a hook

  - You cannot change the name when editing a hook
  - You are not _required_ to provided the config
  - Remove other bits that were copypasta'd from the docs for creating a
    hook
Document check authorization method
Merge pull request #241 from github/doc-token-check

Document check authorization method
Merge pull request #240 from github/fix-docs-for-editing-a-hook

Fix docs for editing a hook
Add url attributes to readme content hash
Move _links to bottom of hash to deemphasize them
Add example response for getting directory content
Document response for getting symlink content
Merge remote-tracking branch 'github/master'
Merge github/master from upstream
Revert "Add docs for org status api"

This reverts commit f18879112096c122b962c3d0e110311785caf695, which was
accidentally added to master. That commit belongs on a branch until it
becomes public in the upstream repo (github/developer.github.com).
Document new pull request listing filters