Fixed permission issue with BlogCategory class
Merge pull request #10 from jeffwhitfield/model-permissions

Fixed permission issue with BlogCategory class
updated the message users see when attempting to view the existing categories and none exist.

added a config.yml file for SS3.1 compatibility.

blog categories are now managed from the blog holder class by default instead of the blog tree class

added a CategoryCloudWidget class and template file.
updated the README.md
Update README.md
Update README.md