Cleaning pjaxr-namespace tags

A namespace declaration such as 
```html
<pjaxr-namespace>
    X.Y.Z
</pjaxr-namespace>
```
should be interpreted as:
```html
<pjaxr-namespace>X.Y.Z</pjaxr-namespace>
```
In case of templating engines, inserting newLines, tabs etc. to beautify Tags