Refactors Style spec to use recipe.bsmx

Instead of using the RECIPE_HASH[:style], Style now imports the recipe.bsmx found in spec/support/.
Adds be_boolean matcher, refactors Mash spec

Mash spec drops use of the RECIPE_HASH[:mash] in favor of import_document.
The specs have been improved and a new be_boolean matcher is in place for
typecast validation.
Refactors Mash::Step specs

Replaces RECIPE_HASH for import_document, cleans up specs, adds 'be_one_of' matcher
Refactors Equipment spec to use import_document
Moves Carbonation to import_document
Purges RECIPE_HASH with purifying fire

All specs use import_document now.