support configurable line height properties on nodes (#24)

Author: ellthompson

src/constants.js

@@ -44,7 +44,8 @@ export var DEFAULT_CONFIG = {
             iconColor: '#F60',
             baseHeight: 28,
             baseWidth: 226,
-            textAlignMiddle: false
+            textAlignMiddle: false,
+            lineHeight: 12
 
         },
         edge: {

src/graph-view-node.js

@@ -103,7 +103,8 @@ class GraphViewNode {
                     fontWeight: 600,
                     width: rectSize.x,
                     height: rectHeight,
-                    lineSpacing: 50
+                    lineSpacing: 50,
+                    lineHeight: this.getSchemaValue('lineHeight')
                 },
                 marker: nodeData.marker ? {
                     refX: rectSize.x - 20,