Allow scoped-properties to be added/removed by name

Also:
  - remove "global" properties
  - clear scoped properties between specs

src/app/syntax.coffee

@@ -22,7 +22,6 @@ class Syntax
     @grammarsByFileType = {}
     @grammarsByScopeName = {}
     @grammarOverridesByPath = {}
-    @globalProperties = {}
     @scopedPropertiesIndex = 0
     @scopedProperties = []
     @nullGrammar = new NullGrammar
@@ -101,18 +100,24 @@ class Syntax
     @grammarsByScopeName[scopeName]
 
   addProperties: (args...) ->
-    selector = args.shift() if args.length > 1
-    properties = args.shift()
+    name = args.shift() if args.length > 2
+    [selector, properties] = args
 
-    if selector
-      @scopedProperties.unshift(
-        selector: selector,
-        properties: properties,
-        specificity: Specificity(selector),
-        index: @scopedPropertiesIndex++
-      )
-    else
-      _.extend(@globalProperties, properties)
+    @scopedProperties.unshift(
+      name: name
+      selector: selector,
+      properties: properties,
+      specificity: Specificity(selector),
+      index: @scopedPropertiesIndex++
+    )
+
+  removeProperties: (name) ->
+    for properties in @scopedProperties.filter((properties) -> properties.name is name)
+      _.remove(@scopedProperties, properties)
+
+  clearProperties: ->
+    @scopedProperties = []
+    @scopedPropertiesIndex = 0
 
   getProperty: (scope, keyPath) ->
     for object in @propertiesForScope(scope, keyPath)
@@ -128,7 +133,7 @@ class Syntax
       while element
         matchingProperties.push(@matchingPropertiesForElement(element, candidates)...)
         element = element.parentNode
-    matchingProperties.concat([@globalProperties])
+    matchingProperties
 
   matchingPropertiesForElement: (element, candidates) ->
     matchingScopedProperties = candidates.filter ({selector}) ->