add easy import of data

[bollwyvl]

While d3 supports xml and json, csv might be easier for most to wrap their head around

Basically, I see two approaches, both of which need to be supported with a common set of blocks.

     ___ _____________________________
    |   V                             |
    |                                 |
    |  load [data](DATA) from source <      [SOURCE]
    |                                 |
    |  ___ ___________________________|
    | |   V
    | |_____________________________
    |_______________________________|

Spreadsheet in the blockd3 environment

              __________________________________________
             |                                          |
[SOURCE]    @ a table called [new table](LOCAL_TABLE)   |
             |__________________________________________|

handsontable is probably a good way to go: while it doesn't have the kilarow chops of SlickGrid, it should be good for most purposes: the emulation of the desktop experience is good enough to get most people on-board quick.

Link to spreadsheet elsewhere

              __________________________________________________________________
             |                                                                  |
[SOURCE]    @ a google spreadsheet at https://...ccc?key= [ABCD1234](API_KEY)   |
             |__________________________________________________________________|

Tabletop.js should allow for some seriously sick interaction with google spreadsheets.

[bollwyvl]

google spreadsheet added (as this required no UI changes)