Let Fx display 'removeOption' correctly

1. Equipment.html: Applying css on <td> might be
problematic on Firefox, therefore we use a <div>
to contain the original content, so that Firefox
can display the "removeOption" button correctly.

2. Equipment.css: Since Firefox does not support
background-position-x/y (only background-position),
and deactivating them seems to make no difference,
therefore I just remove them.

3. WinStats.css: some tweaks.
Let Fx display SkillList correctly
Adjust status align
Make Winstats more like the offical one
Merge pull request #25 from hiunnhue/ui_tweak_fx

Fix css problems on Firefox