[MERGE] repository docs (cleaner still) and GraphIndex

[Aaron Bentley]

Aaron Bentley has voted +1 (conditional).
Status is now: Semi-approved
Comment:
Looks good.

In one place, you used "index's" for the plural of "index".  It should 
either be "indexes" or "indices", depending on how Latin you're feeling.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C1184484793.11530.1.camel%40localhost.localdomain%3E