Improve Closed Room

[BlackRam-oss]

currently closed rooms are a dictionary formed by room id & Commitment.
Commitment: only needed to know start and end date.

the improvement to be made is to create an IntervalTime interface with variables: start & end date. bind it to Commitment and all classes with start & end date. so we can create a dictionary of room id & IntervalTime.

• IntervalTime interface
• tie it to other classes
• Improve Closed Room
• code-snippets
• wiki