Add more detail about our JSON output, along with a small sample. refs #740.
Add the word "dump" to the section headings for clarity.
Merge pull request #1049 from wiredtiger/json-doc

Json doc
Reverse change to use -1, 0 and 1 tests against collation returns,
debugging application collators that return a range of values is a
pain.
Merge branch 'develop' into row-store-internal-page