Remove trailing whitespace
Update headers

* Make the headers (mostly) hierarchical.
* Replace horizontal lines with headers in the Niceties section.
Remove reference to BIG_FREE_READER shutdown

It's been down for quite some time now.
Adjust whitespace, add punctuation
Update paragraph about API key
Merge pull request #300 from Koronen/update-readme

Update README
Revert "Update paragraph about API key"

This reverts commit 9e359ce191e3bc22e771e48a7d91e7b1c39b9a80.

The new paragraph is wrong!
Handle whitespace before closing `>`

Fixes #267.
Merge pull request #301 from Koronen/wbr-whitespace

Handle whitespace before closing `>`
Add missing step in OpenShift docs

Fixes #303.
Merge pull request #304 from Koronen/openshift-gemfile-lock

Add missing step in OpenShift docs
Filter out unprintable characters in StoryRepository#sanitize, fixes #295