Extracted code samples from some Scala JSON docs
Added in a few more help tips with links to other parts of the doco for the ToDo tutorial for both Java and Scala doco
Merge pull request #1651 from jroper/json-docs

Extracted code samples from some Scala JSON docs
Merge pull request #1655 from georgiknox/master

Added in some more detail to both ToDo tutorial doco
Merge remote-tracking branch: upstream/master