Variable values can be of any type, not just String
Allow empty values for target parameters
Add reinterpretation of ReinforceTarget: result of all by regex
Add casting of nested collections to ResourceCollections
Expose build base and sandbox paths as variables
Allow concatenation of non-character and character content when expanding variables
Version 0.1.4:
  * Allow empty values for target parameters
  * Allow using regex to match targets in ReinforceTarget reinterpretation
  * Implement casting nested collections to ResourceCollection
  * Variables can be of any type, not just strings
  * Expose build base and sandbox paths as variables