Fix broken Lens Manual link in README.md
Create LICENSE.txt
Merge pull request #21 from peterjmag/patch-1

Fix broken Lens Manual link in README.md
Fix regression with extractDate.

Now considers year+month only values.
Use more robust implementations for pubinfo.
Integrate author bios and images.
No kittens by default.

Also added ignoredNode handler.
Put in place XML sanatizer function.
Don't add http:// if url starts with a slash.
Consider attrib elements.
Use options on converter level (with default options).
Consider revised date.
Make definition converter more robust.