Add newline-below event

src/app/editor.coffee

@@ -105,6 +105,7 @@ class Editor extends View
       'select-up': @selectUp
       'select-down': @selectDown
       'newline': @insertNewline
+      'newline-below': @insertNewlineBelow
       'tab': @insertTab
       'indent-selected-rows': @indentSelectedRows
       'outdent-selected-rows': @outdentSelectedRows
@@ -702,6 +703,10 @@ class Editor extends View
   insertNewline: ->
     @insertText('\n')
 
+  insertNewlineBelow: ->
+    @moveCursorToEndOfLine()
+    @insertNewline()
+
   insertTab: ->
     if @getSelection().isEmpty()
       if @softTabs

src/app/keymaps/editor.coffee

@@ -5,9 +5,10 @@ window.keymap.bindKeys '.editor',
   'shift-up': 'select-up'
   'shift-down': 'select-down'
   'meta-a': 'select-all'
-  enter: 'newline'
-  tab: 'tab'
-  backspace: 'backspace'
+  'enter': 'newline'
+  'meta-enter': 'newline-below'
+  'tab': 'tab'
+  'backspace': 'backspace'
   'delete': 'delete'
   'meta-x': 'cut'
   'meta-c': 'copy'