make CORS an extra dependency

caravel/__init__.py

@@ -12,7 +12,6 @@
 from flask.ext.appbuilder import SQLA, AppBuilder, IndexView
 from flask.ext.appbuilder.baseviews import expose
 from flask.ext.cache import Cache
-from flask.ext.cors import CORS
 from flask.ext.migrate import Migrate
 
 from caravel import version
@@ -48,6 +47,7 @@
     logging.getLogger().addHandler(handler)
 
 if app.config.get('ENABLE_CORS'):
+    from flask.ext.cors import CORS
     CORS(app, **app.config.get('CORS_OPTIONS'))
 
 

setup.py

@@ -20,7 +20,6 @@
         'cryptography>=1.1.1, <2.0.0',
         'flask-appbuilder>=1.6.0, <2.0.0',
         'Flask-BabelPkg==0.9.6',
-        'Flask-Cors>=2.0.0',
         'flask-cache>=0.13.1, <0.14.0',
         'flask-migrate>=1.5.1, <2.0.0',
         'flask-script>=2.0.5, <3.0.0',
@@ -40,6 +39,9 @@
         'sqlparse>=0.1.16, <0.2.0',
         'werkzeug>=0.11.2, <0.12.0',
     ],
+    extras_require={
+        'cors': ['Flask-Cors>=2.0.0'],
+    },
     tests_require=['coverage'],
     author='Maxime Beauchemin',
     author_email='[email protected]',