DnDice Roller: minor modifications to styling CSS file

minor mods to CSS styling, comment and un-comment line of code for demonstration.
DnDice Roller: minor adjustments to index.html.erb

put a space in the "d__" <td> elements to loosen the look a bit
DnDice Roller: mousescroll functionality for modifier and numberOfDie

Added mousescroll jquery animation in the .js file to make mousescroll numeric inputs possible in the modifier and numberOfDie inout fields.
Merge pull request #1 from crowhead/mousescroller

Mousescroller