[#1734] Documentation for installing npm
[#1734] Fix the linking
Add example of updating a resource from the command line
[#1725] Rename all_field_ids -> column_names

In my opinion, it's a better name.
[#1734] Add clarification about node versions

* Add clarification about node verions and Ubuntu versions.
* Also mention copying main.css to main.debug.css.
Add examples section to API docs
Merge pull request #1823 from ckan/patch-1

Add examples section to API docs
Merge pull request #1734 from ckan/1734-frontend-npm-docs

Can't find main.debug.css error
Merge pull request #1725 from ckan/1725-extend-datastore

Allow the DataStore to be extended