Google Spreadsheets as MMB database

This is incomplete pull request. I'll fill it with more commits when I progress with the implementation.

There are 15 spreadsheets created with data from wiki migrated there. For editing convenience spreadsheets are embedded back into wiki pages (see list in "Spreadsheet column of http://spacexlanding.wikispaces.com/raw_final_fixedMMB).

The idea is to pull data with URLs like https://spreadsheets.google.com/feeds/list/1mE469DE0zUGy9iuySWWQGgFDt2HC5ke4hUy_posFp4o/od6/public/values?alt=json-in-script&callback=db and retrieve data with `$.feed.entry[*].[gsx$framenumber,gsx$latestmmbcode]`.

This is read-only approach, making human responsible for spreadsheet update yet, but first step into creating "best MMBs" database. The "embedded spreadsheet" approach does not allow embedding the images into Google Spreadsheet, but having structured information in spreadsheet, it should be fairly simple to recreate the original table with simple spreadsheet query and sequential image generation, this would make images to always be up-to-date.