Auto-update dependencies. [(#1133)](GoogleCloudPlatform/python-docs-samples#1133)

* Auto-update dependencies.

* Fix missing http library

Change-Id: I99faa600f2f3f1f50f57694fc9835d7f35bda250

Author: dpebot

samples/snippets/api/requirements.txt

@@ -1 +1,3 @@
-google-api-python-client==1.6.3
+google-api-python-client==1.6.4
+google-auth==1.1.1
+google-auth-httplib2==0.0.2

samples/snippets/movie_nl/requirements.txt

@@ -1,2 +1,4 @@
-google-api-python-client==1.6.3
+google-api-python-client==1.6.4
+google-auth==1.1.1
+google-auth-httplib2==0.0.2
 requests==2.18.4

samples/snippets/ocr_nl/requirements.txt

@@ -1 +1,3 @@
-google-api-python-client==1.6.3
+google-api-python-client==1.6.4
+google-auth==1.1.1
+google-auth-httplib2==0.0.2

samples/snippets/syntax_triples/requirements.txt

@@ -1 +1,3 @@
-google-api-python-client==1.6.3
+google-api-python-client==1.6.4
+google-auth==1.1.1
+google-auth-httplib2==0.0.2

samples/snippets/tutorial/requirements.txt

@@ -1 +1,3 @@
-google-api-python-client==1.6.3
+google-api-python-client==1.6.4
+google-auth==1.1.1
+google-auth-httplib2==0.0.2