v2.2.0

Change log:

• Full line text highlighting (no partial inline highlighting yet)
• Controlling maximum number of lines per paragraph in PDF
• Add page numbers padded with dots to the Table of contents index page
• Rendering a custom header/footer for each page
• Bullet points per line with optional spacing
• Links to URLs
• Links to page numbers
• Expose JsPDF API
• Page margins from 4 directions
• Complete README
• Add MIT LICENSE file