Kwargs fix & new demo

Updates kwargs handling to be more inline with how python does it.
Updates demo.html to load external libraries the new way

X Axis Fix

Merge pull request #9 from prescod/show_x_axis

Pass x_axis values to HighCharts.

Constructor keyword argument fix

Merge pull request #5 from trinketapp/4-kwargs

Checks that keyword arg value is defined. Fixes #4.

Call stack size bug fix

Merge pull request #3 from trinketapp/stack-size-fix

Fixes maximum call stack issue by directly referencing attributes.

v0.1.1

Updates skulpt dependency from master so bower doesn't complain

Bar chart ordering fixed

Merge pull request #1 from trinketapp/eah13-patch-1

set series index to match legendIndex