v0.2.0

Changes:

• Don't absorb the wheel event if scroll is at the end of range #33 #84
• Fix vertical positioning errors and pixels bleeding through 1px gaps
• Improve perf (good speed up for Firefox) by moving all rows within a container rather than each row by itself #5
• Use Babel for transform (remove the need for global polyfills, Object.assign) #102
• Add UMD support to dist build #103
• Make footer stay on the bottom when using Height prop #97
• Unify footer data API with header/groupHeader data API