Add a setting for enable format attributes for new line

[wluo]

if the tag have many attributes it will format the tag into one line for now.
In this case may be every attributes formated into each line looks better.
e.g: <tag name="abc" age="tgg" nation="USA" ... >wluo</tag"
format into:
<tag
name="abc"
age="tgg"
nation="USA"
...

wluo

[Alexey Nesterov]

Hi,
sorry, but I don't have plans to implement it in nearest future. Feel free to submit pull-requests!