KG 0.44 - Pods description should be restricted in content and length.

[NotChristianGarcia]

Currently each pod gets a description field, defaulting to ''. This field is user define-able however and should have some hard limits.

In particular, description should:

• Be shorter than 255 (arbitrary) characters.

• Should only allow allow regular characters: [a-z][A-Z][0-9]!.?@#',"-_ (More can be allowed if preferred)

  If description does not mean the above criteria then a friendly error message should be given to the user.

  Additionally. After completing the initial task, add at least two tests, one to ensure valid description's work correctly. And a second to ensure invalid descriptions give the correct error message.

[NotChristianGarcia]

Completed by Jason Kim in commit 555556dcd62fb0efc46b684d6062fe215fa940e2