Merge branch 'develop' into 7.x-1.x

7.2 Release for govCMS CKAN.

- Fixes #74 Adds support for non-standard CKAN ports
- Fixes #76 for formatting improvements
- Adds defensive coding practises to prevent errors
- Updates max lenght on URL field
- Adds record limit configuration by variables
- Adds cache control per graph
- Addresses IE11 download issue