[Gutter][style] Add parentheses to some method calls for readability

src/gutter-container.coffee

@@ -31,10 +31,10 @@ class GutterContainer
     options = options ? {}
     gutterName = options.name
     if gutterName == null
-      throw new Error 'A name is required to create a gutter.'
-    if @gutterWithName gutterName
-      throw new Error 'Tried to create a gutter with a name that is already in use.'
-    newGutter = new Gutter this, options
+      throw new Error('A name is required to create a gutter.')
+    if @gutterWithName(gutterName)
+      throw new Error('Tried to create a gutter with a name that is already in use.')
+    newGutter = new Gutter(this, options)
 
     inserted = false
     # Insert the gutter into the gutters array, sorted in ascending order by 'priority'.
@@ -81,7 +81,7 @@ class GutterContainer
   # Processes the destruction of the gutter. Throws an error if this gutter is
   # not within this gutterContainer.
   removeGutter: (gutter) ->
-    index = @gutters.indexOf gutter
+    index = @gutters.indexOf(gutter)
     if index > -1
       @gutters.splice(index, 1)
       @unsubscribe gutter
@@ -97,4 +97,4 @@ class GutterContainer
     else
       options.type = 'gutter'
     options.gutterName = gutter.name
-    @textEditor.decorateMarker marker, options
+    @textEditor.decorateMarker(marker, options)

src/gutter.coffee

@@ -49,7 +49,7 @@ class Gutter
   #   * `item` (optional) A model {Object} with a corresponding view registered,
   #     or an {HTMLElement}.
   decorateMarker: (marker, options) ->
-    @gutterContainer.addGutterDecoration this, marker, options
+    @gutterContainer.addGutterDecoration(this, marker, options)
 
   # Calls your `callback` when the {Gutter}'s' visibility changes.
   #

src/text-editor.coffee

@@ -114,7 +114,7 @@ class TextEditor extends Model
       @emit 'scroll-left-changed', scrollLeft if includeDeprecatedAPIs
       @emitter.emit 'did-change-scroll-left', scrollLeft
 
-    @gutterContainer = new GutterContainer this
+    @gutterContainer = new GutterContainer(this)
     @lineNumberGutter = @gutterContainer.addGutter
       name: 'line-number'
       priority: 0
@@ -514,7 +514,7 @@ class TextEditor extends Model
   # Public: Creates and returns a {Gutter}.
   # See {GutterContainer::addGutter} for more details.
   addGutter: (options) ->
-    @gutterContainer.addGutter options
+    @gutterContainer.addGutter(options)
 
   # Public: Returns the {Array} of all gutters on this editor.
   getGutters: ->
@@ -522,7 +522,7 @@ class TextEditor extends Model
 
   # Public: Returns the {Gutter} with the given name, or null if it doesn't exist.
   gutterWithName: (name) ->
-    @gutterContainer.gutterWithName name
+    @gutterContainer.gutterWithName(name)
 
   # Calls your `callback` when a {Gutter} is added to the editor.
   # Immediately calls your callback for each existing gutter.