[#973] Make sure we always talk about datastore resource and not just resources, extend introduction to include motivation for the datastore
[#973] Improve references in data viewer docs
[#973] Restructured Datastore description. Introduction is much simpler and shorter.
Merge branch 'master' into 973-datastore-docs-improvements

Conflicts:
	doc/data-viewer.rst
[#973] Fix merge
[#1180] Raise 404 for org or group if called wrong

Raise a 404 if a group is called by organization_show
and vice versa.
[#1211] Add exception guidelines to Python coding standards
Add logging example to Python coding standards
Correct some Sphinx formatting
Correct some grammar.
Fix the title styles in a docs file
Add docstring guidelines for cross-referencing code objects
Remove formatting cleanups stuff from coding standards

This coding standard was wrong
Reorder some docs subsections
Docs: add a bullet-point
Add a cross-ref in the docs
Merge branch 'master' of github.com:okfn/ckan into 973-datastore-docs-improvements
Merge branch '973-datastore-docs-improvements' of github.com:okfn/ckan into 973-datastore-docs-improvements
[#973] Fix a broken Sphinx reference
Merge branch '973-datastore-docs-improvements'