Initial / retained context values, bug fixes, image smoothing quality

#125

• Fix measureText / getTextSize following TypeScript upgrade (in v0.7.0) backported to 0.7.3
• Add setImageSmoothingQuality and getImageSmoothingQuality
• Set initial canvas values upon construction (for cross-browser consistency)
• Restore canvas context values when resizing the element (including clearing the canvas)
• Update docs examples
• Improve density in examples
• Fix redrawing bug in IE multi-line text example (by calling beginPath before drawing lines)
• Add module entry to package.json

Measure text fix

#126

DEPRECATED Fixes canvas density bug introduced in 0.7.1

#123

Although this release fixed the serious bug in 0.7.1 there were other complications introduced in 0.7.0

DEPRECATED Clearing canvas density fix

Issue: #114
Fix: #122

This has a serious bug that caused the canvas to grow in size every re-render with densities higher than 1

DEPRECATED TypeScript >= 3.1.6 support

This introduced a bug with measureText / getTextSize (causing issues with multi-line text)

IE window.console access

Hopefully fixes console access bug

#118

Further IE fixes

Safegaurd console warning #117

IE9 fixes (safegaurd console)

• Upgrade node, typescript, react, jest and config for CircleCI 2 #115

• Fix deployments #116