Location search (#212)

* Add %location search option

Search for posts for a given location ID using %[location id] as the query

* Document %location search

* Make pylint happy

* Use correct paths for location results

* Fix —help output

Add description of location argument and fix output error for short help.

* Add unit tests for location download

* Add extra unit test for locations

test/instaloader_unittests.py

@@ -12,6 +12,7 @@ PROFILE_WITH_HIGHLIGHTS = 325732271
 PUBLIC_PROFILE = "selenagomez"
 PUBLIC_PROFILE_ID = 460563723
 HASHTAG = "kitten"
+LOCATION = "362629379"
 OWN_USERNAME = "aandergr"
 NORMAL_MAX_COUNT = 2
 PAGING_MAX_COUNT = 15
@@ -69,6 +70,15 @@ class TestInstaloaderAnonymously(unittest.TestCase):
             if count == PAGING_MAX_COUNT:
                 break
 
+    def test_location_download(self):
+        self.L.download_location(LOCATION, NORMAL_MAX_COUNT)
+
+    def test_location_paging(self):
+        for count, post in enumerate(self.L.get_location_posts(LOCATION)):
+            print(post)
+            if count == PAGING_MAX_COUNT:
+                break
+
     def test_get_id_by_username(self):
         self.assertEqual(PUBLIC_PROFILE_ID,
                          instaloader.Profile.from_username(self.L.context, PUBLIC_PROFILE).userid)