Use plain import instead of from import

Because as far as I'm aware from X import Y isn't preferred and also
using a plain import is how we are doing it in simplenote.vim.

I'm not sure what should be done in __init__.py though so I've left that
alone for now.

README.rst

@@ -21,8 +21,8 @@ Usage
 ======
 simplenote.py can be imported into any python module::
 
-    from simplenote import Simplenote
-    simplenote = Simplenote(user, password)
+    import simplenote
+    simplenote = simplenote.Simplenote(user, password)
 
 The object then provides the following API methods::
 

docs/index.rst

@@ -27,8 +27,8 @@ with the service.
 
 First import the module and create an object::
 
-    from simplenote import Simplenote
-    simplenote = Simplenote(user, password)
+    import simplenote
+    simplenote = simplenote.Simplenote(user, password)
 
 This object then provides the following API methods::
 

tests/test_simplenote.py

@@ -6,15 +6,14 @@
 #Override NOTE_FETCH_LENGTH for testing purposes
 import simplenote
 simplenote.simplenote.NOTE_FETCH_LENGTH = 5
-from simplenote import Simplenote, SimplenoteLoginFailed
 
 class TestSimplenote(unittest.TestCase):
 
     @classmethod
     def setUpClass(cls):
         cls.user = "simplenote-test@lordofhosts.de"
         password = "foobar"
-        cls.simplenote_instance = Simplenote(cls.user, password)
+        cls.simplenote_instance = simplenote.Simplenote(cls.user, password)
 
     def setUp(self):
         self.clear_all_notes()
@@ -47,8 +46,8 @@ def test_simplenote_auth(self):
         self.assertNotEqual(None, token)
 
     def test_simplenote_failed_auth(self):
-        s = Simplenote(self.user, "")
-        self.assertRaises(SimplenoteLoginFailed, s.get_token)
+        s = simplenote.Simplenote(self.user, "")
+        self.assertRaises(simplenote.SimplenoteLoginFailed, s.get_token)
 
     def test_simplenote_get_list_length(self):
         res, status = self.simplenote_instance.get_note_list()