Found pattern parameter data bleeding into global data object

Closes #139

Author: bmuenzenmeyer

CHANGELOG

@@ -2,6 +2,7 @@ THIS CHANGELOG IS AN ATTEMPT TO DOCUMENT CHANGES TO THIS PROJECT.
 
 PL-node-v0.11.0
  - ADD: Ignore pattern directories that start with an underscore.
+ - FIX: Resolved issue where pattern parameter data bled into global data object
 
 PL-node-v0.10.1
  - ADD: Added more unit tests for recently more-modular code

builder/parameter_hunter.js

@@ -41,13 +41,13 @@
 
 					//compile this partial immeadiately, essentially consuming it.
 					var partialPattern = pattern_assembler.get_pattern_by_key(partialName, patternlab);
-					var existingData = pattern.data || patternlab.data;
+					var existingData = pattern.data ? JSON.parse(JSON.stringify(pattern.data)) : JSON.parse(JSON.stringify(patternlab.data));
 
 					//merge paramData with any other data that exists.
 					for (var prop in paramData) {
 						if (existingData.hasOwnProperty(prop)) {
 							existingData[prop] = paramData[prop];
-						} 
+						}
 					}
 
 					//extend pattern data links into link for pattern link shortcuts to work. we do this locally and globally