fix(chart): Fix CircleChart resize issues

== DETAILS
When a CircleChart is sized to anything other than 110x110 it's center is offset.

src/components/charts/CircleChart/Circle.examples.md

@@ -1,3 +1,9 @@
 Standard Radial Chart
 
-     <CircleChart endPercentValue={'75k'} border={5} endPercent={0.45} backgroundOpacity={0.5} />
+     <CircleChart endPercentValue={'75k'} border={5} endPercent={0.45} backgroundOpacity={0.5} />
+
+Smaller Radial Chart
+
+     <div style={{fontSize:'10px', width:'75px'}}>
+      <CircleChart endPercentValue={'75k'} border={5} radius={35} endPercent={0.25} backgroundOpacity={0.5} padding={2} />
+     </div>

src/components/charts/CircleChart/Circle.jsx

@@ -3,29 +3,30 @@ import React from 'react'
 import palette from '../../../palette'
 import filterAttributesFromProps from '../../../util/externalAttributeFilter'
 
-var d3 = Object.assign({}, require('d3-shape'))
+const d3 = Object.assign({}, require('d3-shape'))
 
 const twoPi = Math.PI * 2
-// const formatPercent = d3.format('.0%');
 
 const CircleChart = (props) => {
-  const { color, border, endPercent, radius, padding, backgroundOpacity } = props
+  const {color, border, endPercent, radius, padding, backgroundOpacity} = props
+  const center = radius + padding
   const boxSize = (radius + padding) * 2
   const endPercentValue = props.endPercentValue
 
   const arc = d3.arc()
-            .startAngle(0)
-            .innerRadius(radius)
-            .outerRadius(radius - border)
+    .startAngle(0)
+    .innerRadius(radius)
+    .outerRadius(radius - border)
   const arcbg = d3.arc()
-            .startAngle(0)
-            .innerRadius(radius - 4)
-            .outerRadius(radius - 1)
+    .startAngle(0)
+    .innerRadius(radius - 4)
+    .outerRadius(radius - 1)
   const externalAttributes = filterAttributesFromProps(props)
+
   return (
     <div {...externalAttributes} >
       <svg width={boxSize} height={boxSize}>
-        <g transform='translate(55,55)'>
+        <g transform={`translate(${center},${center})`}>
           <g className='progress-meter'>
             <path
               className='background'