feat(hovering): Ability to apply hover effects on entire row

[troywoy]

Currently there is no way via CSS to apply a :hover effect when using multiple viewports (which happen when using things such as ui-grid-pinning, ui-grid-grouping, etc).

Using ui-grid-selection as a starting example, ui-grid-hovering can be written as something like: http://plnkr.co/edit/SG8GCH9O3GKLAxKjrnjn?p=preview.

[mckramer]

Here's a more in-depth example with a pinned column using the solution from @twh1808. If you remove ui-grid-hovering, you can see what happens today: http://plnkr.co/edit/7ldDniJIGjHVETs3VFn1?p=preview.

@twh1808, have you consider submitting a PR? Or have you adopted an alternate solution to this problem?

[troywoy]

@mckramer, I am still using the solution I wrote in my own environment (included locally). A fellow colleague of mine and myself have made a few requests which are mostly disregarded, so I haven't taken time to create a PR for it fearing it's wasting my time.