Use an absolute path for requirements list in setup file

- Replace the 
ead_requirements() function with one that reads from an absolute path in the root folder.
- Fixes #19. (Or will it?)

Author: LuisAPI

setup.py

@@ -4,7 +4,8 @@
 import os
 
 def read_requirements():
-    with open('requirements.txt') as f:
+    req_path = os.path.join(os.path.dirname(__file__), "requirements.txt")
+    with open(req_path) as f:
         return f.read().splitlines()
 
 # Load environment variables