New d3 (including geo things and topojson).

I am using the pre-minimized files from the d3 main website (except for adding reference headers).
Cleaned up internal backend field names.

Does not touch the data preparation layer or Json data format.

Old and new names are as follows:
dbid id
eventRoot predicate
locationText location
currentCountryText currentcountry
personText person
categoryText category
organizationText organization
airportText airport (for avherald only)
Merge pull request #101 from sfu-natlang/d3andfieldnamecleanup

New version of d3 and cleaned up internal backed fields