Updated docs to show usefulness of sails console

I added a waterline example and an example of how to see sails core via the sails console.
Updated links

Updated links
Add documentation for config/env folder. Fixes #272
Fix collection typo
Merge pull request #300 from m-bodmer/typo-fix-1

Fix collection typo
Merge pull request #298 from luislobo/patch-3

Updated links
Merge pull request #220 from JemiloII/patch-7

Updated docs to show usefulness of sails console
Merge pull request #299 from m-bodmer/master

Add documentation for config/env folder. Fixes #272