Don't fill comments. Affects #141
Refactor and simplify sx-question-mode--skip-FOO functions.

They no longer need to worry about restoring point. Just move point to
its destination and return non-nil if it worked.
Don't fill headlines
Reimplement reference not-filling
Reorganize functions.
Fix return values
Merge pull request #165 from vermiculus/better-filling

Better filling

Ignore HTML comments when filling body text and do not attempt to fill headlines.
Hotfix require subr-x

For `string-trim-right'
Hotfix switch-tab
Hotfix subr-x didn't exist before 24.3
Displaying questions uses pop-to-buffer instead of switch by default

Fixes #153
See variable `sx-question-mode-display-buffer-function'
Indentation was off by one
Prefer zlib-decompress-region when available.

Fix #157
Handle utf-8 encoding the right way.
Hotfix, don't barf on links we don't understand.

These are usually not links. See the end of http://emacs.stackexchange.com/q/3727/50
Hot fix #171. Check if .score is a number
Merge pull request #170 from vermiculus/issue-#157--zlib

Use `zlib-decompress-region` when available (24.4+) and handle UTF-8 encoding correctly.
Add screenshot
Define assoc let first
Merge pull request #176 from vermiculus/define-assoc-let-first

Define assoc let first