Stop showing broken image icon on the new post page

Check if the $dbType property isset on the Config class

closes #36

* it sometimes confuses web servers to have a folder named "editor" while also serving routes with the same name
* dropped appcache stuff since it wasn't working super well
* add nginx config to the readme

Explicitly define $dbType for default MySQL config

Fix publish now dropdown's position so it doesn't scroll off

Closes #11

The `helper.php` checks for the `dbType` property on the 
`Config` class. Since nothing is defined it throws:

```
Fatal error: Access to undeclared static property: 
Config::$dbType in …/Quill/lib/helpers.php on line 3
```

Quill corrects the photo rotation based on exif data since iOS tends to take landscape photos and set the rotation bit when holding it in portrait mode.

Correct link formatting in the README.md

null-check for $url before checking for key

Comes up for Known which gives funky syndication-target IDs like twitter::kylewmahan.

paths are allowed in Quill URLs now

fixes #18

Don't use php shorttags

Simple .htaccess file to get it working on Apache

closes #4