ctrl-a moves the cursor to the beginning of the line on OS X

Keybinding now matches default OS behavior

keymaps/darwin.cson

@@ -99,7 +99,7 @@
   'cmd-shift-right': 'editor:select-to-end-of-line'
   'alt-backspace': 'editor:backspace-to-beginning-of-word'
   'alt-delete': 'editor:delete-to-end-of-word'
-  'ctrl-a': 'editor:move-to-first-character-of-line'
+  'ctrl-a': 'editor:move-to-beginning-of-line'
   'ctrl-e': 'editor:move-to-end-of-line'
   'ctrl-k': 'editor:cut-to-end-of-line'