Fixed exception on empty tSpans

Fixed npm main entry.

Supports source maps for developers and improved license visibility in output files.

Allow for more than just word characters in IRI references

This release restructures the repository and thus is incompatible with previous releases. The API has not changed, though and thus is "soft" backward-compatible.
This release now uses fontello/svgpath to be able to correctly deal with more complex svg path declarations. Kudos go to @puzrin!
This release provides ready to use browserified bundle files in the /dist directory that already include the rgbcolor and svgpath dependencies. All that is left is jspdf to get started, now!