Item Collection: Column span should be determined by the row with the most columns

[StephenEsser]

Issue Description

The ItemCollection column span is currently determined by the first row. The entire collection can only have as many columns as the first row has. Displays, accessories, and comments in subsequent rows are ignored if they exceed the column span of the first row.

Issue Type

• New Feature
• Enhancement
• Bug
• Other

Expected Behavior

Row column spans are not tied to the column span of the first row

Current Behavior

Each row is limited to the column span of the first row

Steps to Reproduce

1. Create an Item Collection similar the one displayed here: http://engineering.cerner.com/terra-clinical/#/site/item-collection
2. Add additional displays, comments, or accessories to any row other than the first
3. Observe the added content is not displayed if it exceeds the column span of the first row
   ( It is also possible to delete items in the first row and see the following row column span reduce )

Environment

• Component Version:
• Browser Name and Version:
• Operating System and version (desktop or mobile):