read the docs requirements

documentation/conf.py

 import sys
+import subprocess, os
 
-# sys.path.append( "/software/bDreathe-4.14.2/" )
+read_the_docs_build = os.environ.get('READTHEDOCS', None) == 'True'
+
+if read_the_docs_build:
+
+    subprocess.call('cd ../doxygen; doxygen', shell=True)
+    
 
 # -- Project information -----------------------------------------------------