Add character counter on individual status page.

Fixes #91.
Merge pull request #103 from mvitz/fix-charcount-on-update-page

Add character counter on individual status page.
Add missing patterns and reordered gitignore.

- .lein-repl-history exists after running lein repl
- .nrepl-port exists while running lein repl
- .lein-failures exists after running lein test
- order is taken from: https://www.gitignore.io/api/clojure
Fix generated HTML of navigation box.

Instead of something like ```<li>Section<li>Link</li></li>``` now
```<li>Section</li><li>Link</li>``` is generated.
Add client side opt in for image inlining.

Refers to #92.

Currently to preserve behaviour image inling is turned on by default and
the user has no option to disable it. This will be added later.
Extract methods for navigation sections.

This allows adding new sections which contains other items than simple
links.
Add preference section to navigation box.

Fixes #92.

This enables the user to opt in for image inlining. By default image
inlining is disabled.