Move editor specific files into a new DartEditor.gitignore

Dart.gitignore

@@ -1,7 +1,5 @@
-// Don’t commit the following files and directories created by pub, Dart Editor, and dart2js
+// Don’t commit the following files and directories created by pub and dart2js
 packages/
-.project
-.buildlog
 *.js_
 *.js.deps
 *.js.map
@@ -11,6 +9,3 @@ pubspec.lock
 
 // Avoid committing generated JavaScript files
 *.dart.js
-
-// Check for any other incovenient files generated by OS 
-// and other tools such as Eclipse, IntelliJ, etc.