Added Nebraska scraper

Initial work by @rnelson and @dlipskey
Fixed the NE scraper as of 2014-03-17

CSS style on some table cells changed, which broke the parser. That
particular issue is now fixed as we're looking for the nth child <td>
instead of the nth child node with .cell-purch.
add 'type' field to RFP output
Merge branch 'opennebraska-ne-scraper'

Conflicts:
	package.json