Add screenshot grabber for documentation.

Author: Matthew Wardrop

docs/update_screenshots.py

@@ -0,0 +1,20 @@
+import sys
+sys.path.insert(0, '..')
+
+import threading
+from selenium.webdriver import Chrome
+import knowledge_repo
+
+def take_screenshots():
+    driver = Chrome()
+    driver.get('http://127.0.0.1:7000')
+    driver.set_window_size(1260, 800)
+    driver.save_screenshot('main.png')
+
+    driver.find_element_by_css_selector('.feed-post').click()
+    driver.save_screenshot('post.png')
+    driver.close()
+
+threading.Timer(1.25, lambda: take_screenshots()).start()
+
+knowledge_repo.KnowledgeRepository.for_uri('../tests/test_repo').get_app().run(port=7000)