Use ‘atom-text-editor’ custom tag name for TextEditorElement

dot-atom/keymap.cson

@@ -9,7 +9,7 @@
 #
 # Here's an example taken from Atom's built-in keymap:
 #
-# '.editor':
+# 'atom-text-editor':
 #   'enter': 'editor:newline'
 #
 # '.workspace':

dot-atom/styles.less

@@ -12,10 +12,10 @@
 
 }
 
-.editor {
+atom-text-editor {
 
 }
 
-.editor .cursor {
+atom-text-editor .cursor {
 
 }