Fixed a bug where references between nodes would not work in Safari.

• fix all kinds of node references (nodes, that are referenced elsewhere no longer need to be defined within a <defs> node
• fix xml whitespace bug (text and tSpans with whitespace now render correctly)
• support for "transparent" color attributes
• fix issue, when a node had fill="none" and stroke="none"

• support for <clipPath> element (transforms on elements within a clipPath are NOT supported!)
• support for <polyline> elements
• fixes for text positioning, inline SVGs
• uses jsPDF 2.0.0 now

• refactoring of test suite
• improvements and fixes to patternUnits and patternTransform attributes
• fix viewBox default values
• fix svg data url parsing
• fix font-family attribute parsing
• fix font-weight and font-style
• updated dependencies

• support for custom fonts
• performance optimization for text
• support for svg inline data urls for image elements
• bugfixes

Fixes another visibility issue with nested tspans ( #28 ).

Improved support for inherited (in-)visibility and attributes in CSS declarations. More graceful handling of external and "tainted" canvas images. Improved marker rendering.

Fixes #7, #12, #18, #27, #28, and #30.

bumped jsPDF-yWorks to 1.2.69

fixes #22 - arcs not working except in Chrome

Fixed rendering of text elements containing descriptive elements