[Property View] Use jQuery UI button to reimplement delete button.

[xuqingkuang]

For hover effect.

[grgustaf]

The icon and button should match the one on the home/projects page. The size of the icon part should be the same size, and preferably the button should be the same size as well. For this new one, the icon is smaller and the button is bigger.

Also, the border should be the same. This one gains a border on hover, and flashes white on active. The home page one always has a border and flashes dark gray on active. The ones on the home page are according to the design mockups we had, so let's follow that for this one, hopefully reusing the same CSS classes.

[xuqingkuang]

@grgustaf and @zhizhangchen The code updated for your comments, please review, thanks a lot!

[grgustaf]

Merged