Tweak some things

- Add package.json
- Add moment for better timestamp display (in example)
- Remove -src in source filename
Add README.md
Restructure things a bit
Convert to Sass
Update README
Significant rework of code; new features include:

- Pause button
- Next/Previous
- Updating date/map on drag
Update readme again
Merge branch 'master' of github.com:skeate/Leaflet.timeline

Conflicts:
	README.md