use lodash.isEqual for data equality comparison

[sheminusminus]

updated the data/nextData comparison in sematable.js's componentWillReceiveProps to use lodash.isEqual method (https://lodash.com/docs/#isEqual).

reasoning:

when using table data that wasn't held in application-wide state, and was instead created inside a redux container and subsequently passed-in via mapStateToProps, a table in our application was experiencing an infinite render loop.

data !== nextProps.data always returns true when using this method, but doesn't when checking for deep equality.

this doesn't seem to have a performance impact loading a couple hundred paginated data rows, although i'm not sure if that will remain the case at larger scales.

closes #60

edit: currently, the only possible solution would be for me to store an entirely new state object, even though it's essentially just a join between two other object trees that already exist in state. this should be achievable through redux containers.