Revert readthedocs build

Author: alexsocha

docs/requirements.txt

@@ -0,0 +1,7 @@
+sphinx>=1.5
+recommonmark
+sphinx_rtd_theme
+nbsphinx>=0.2.13
+jupyter_sphinx
+pytest_check_links
+pypandoc

readthedocs.yml

@@ -5,9 +5,8 @@ build:
 
 python:
   version: 3.6
-  pip_install: true
-  extra_requirements:
-    - docs
+  setup_py_install: true
+  requirements_file: docs/requirements.txt
 
 conda:
   file: docs/environment.yml

setupbase.py

@@ -20,6 +20,10 @@
 import subprocess
 import sys
 
+# MODIFIED: Added readthedocs detection
+def in_read_the_docs():
+    return os.environ.get('READTHEDOCS') == 'True'
+
 
 # BEFORE importing distutils, remove MANIFEST. distutils doesn't properly
 # update it when the contents of directories change.
@@ -176,6 +180,9 @@ def create_cmdclass(prerelease_cmd=None, package_data_spec=None,
 
     if 'bdist_egg' in sys.argv:
         egg = wrapper(bdist_egg, strict=True)
+    # MODIFIED: Enable setup.py install in readthedocs so that files can be modified (like pip install -e)
+    elif in_read_the_docs():
+        egg = wrapper(bdist_egg, strict=True)
     else:
         egg = bdist_egg_disabled