Adding index sortable example

[aschmoe]

RE: #91

Adds react-sortable-hoc example, adds index prop to ValueComponent

Work largely done by @pwhipp

[coveralls]

Coverage remained the same at 94.973% when pulling 35e895a on aschmoe:adding-index-sortable-example into 851d94b on JedWatson:master.

[coveralls]

Coverage remained the same at 94.973% when pulling 35e895a on aschmoe:adding-index-sortable-example into 851d94b on JedWatson:master.

[JedWatson]

@aschmoe this looks great! I'm about to publish a new patch version with other small fixes, and don't have time to review this fully before then but will come back to it asap.

Would you mind amending the PR to not include the changes to the build files please? dist and lib get updated when I publish new versions, including them in PRs can be problematic. We just need the changes to the src and style folders.

Thanks!

[aschmoe]

@JedWatson build files have been removed (though I've just realized not examples/dist so I'm removing that as well until I hear otherwise)

[coveralls]

Coverage remained the same at 94.973% when pulling 6c2dc9c on aschmoe:adding-index-sortable-example into 82910d9 on JedWatson:master.

[coveralls]

Coverage remained the same at 94.973% when pulling 6c2dc9c on aschmoe:adding-index-sortable-example into 82910d9 on JedWatson:master.

[coveralls]

Coverage remained the same at 94.973% when pulling 6c2dc9c on aschmoe:adding-index-sortable-example into 82910d9 on JedWatson:master.

[wimoMisterX]

@JedWatson when could I expect a release with this PR being merged?

[liegeandlief]

@aschmoe - Really like this! One thing I noticed is that when clicking on an option to drag it, it causes the select input to open. Is it possible/desirable to prevent this, perhaps using the onSortStart option in react-sortable-hoc?

[jossmac]

LGTM @aschmoe

Please resolve the conflict, then this is good to merge

[elyobo]

A useful example to have, can we get this conflict resolved so that it can be merged?

[JedWatson]

Thanks everyone who had a hand in this - with #3792 it's finally live