Please define key terms

[baron1405]

Thanks for this great project! I truly appreciate your ARCHITECTURE document but I am unclear on the definitions for a number of terms. Could you provide definitions and examples for the following terms:

• Activate
• Specification
• Requirement
• Possibility

In addition, can you clarify whether a PossibilitySet is a group of versions of the same artifact, with each version having the same transitive dependencies each with the same version range?

[baron1405]

I have also asked on crystal-lang/crystal-molinillo#9.

[MXzander]

Thanks for this great project! I truly appreciate your ARCHITECTURE document but I am unclear on the definitions for a number of terms. Could you provide definitions and examples for the following terms:

• Activate
• Specification
• Requirement
• Possibility

In addition, can you clarify whether a PossibilitySet is a group of versions of the same artifact, with each version having the same transitive dependencies each with the same version range?

#180 (comment)