correct George Washington date of death in lifelines

was incorrectly specified as Dec 24, 1799 rather than what wiki says
should be
Dec 14, 1799

Date.parse("Dec 14, 1799")
-5366196000000
Add explicit import of d3.
Add npmignore.
Merge pull request #18 from timelyportfolio/master

very unimportant correction of George Washington date of death in lifelines.json spec
Merge remote-tracking branch 'remotes/upstream/master'