Add option to set background and line color for tables

[luciarodriguez]

Right now, Livewire sets a gray/white background color sequence. It would be particularly useful for tables with only images to have the same background colors and no line colors.

[craigshoemaker]

@luciarodriguez does the table-plain class I implemented address this issue for you?

[luciarodriguez]

@craigshoemaker It does if the table only contains images, like in Image 1 for example. However, in Image 2, I still need the table to have horizontal lines, not just vertical ones.

Could you create a second class that looks like the table-plain one, but also has horizontal lines? "table-plain" works great for images like the first one and I'd like to keep it.

Desktop_Tables.zip