Fix caseywebdev#81 Prevent 0-size container, 0.7.11

Remove needless cancelAnimationFrame, 0.7.10

Close caseywebdev#68, Add scrollParentGetter prop, 0.7.9

Improve initialIndex implementation, 0.7.8

Fix caseywebdev#70 (again) Avoid React findDOMNode warning, 0.7.6

Fix caseywebdev#70 Avoid React findDOMNode warning, 0.7.5

Fix caseywebdev#69 Correct getVisibleRange behavior, 0.7.4

Fix caseywebdev#59 Use documentElement[scrollkey] for Firefox, 0.7.3

Close caseywebdev#57 Add getVisibleRange method, 0.7.2