XML conversion does not preserve tag case.

Test input:

```
<?xml version="1.0" encoding="UTF-8" ?>
<TestTag AwesomeAttr="Cool">Content</TestTag>
```

Expected output:

```
!!! XML
%TestTag{:AwesomeAttr => "Cool"} Content
```

Actual output:

```
!!! XML
%testtag{:awesomeattr => "Cool"} Content
```

This breaks some things unfortunately :/
EDIT: attributes also have their case destroyed; test case and outputs updated accordingly.
