Add stylesheet for tagcloud

[SilverRainZ]

PR Description

Add a stylesheet for tagcloud, as it is removed in #144, close #267.

[SilverRainZ]

@nabobalis I created a demo using ablog start, the stylesheet seems to work fine on index.html, but every tag in post page has line-break(and font-size takes no effect), but they are the same in both HTML and CSS, I am not sure why, do you have any idea?

index: http://silverrainz.me/ablog-demo/

post page: http://silverrainz.me/ablog-demo/third-post/

[nabobalis]

The ablog css is missing if I look at the sources under _static. Don't know why.

[SilverRainZ]

OK, I need to use pathto to get correct path to _static files, everything goes well now.

[nabobalis]

Thanks @SilverRainZ