Trouble building SpongeDocs theme


I’m trying to pull up the live instance of SpongeDocs for editing, and I keep getting this error:

jbyoshi@JBYOSHI-LAPTOP ~/git/SpongeDocs $ pip install -r etc/requirements.txt 
Requirement already satisfied: sphinx-intl==0.9.7 in /home/jbyoshi/.local/lib/python2.7/site-packages (from -r etc/requirements.txt (line 1))
Requirement already satisfied: sphinx==1.3.3 in /home/jbyoshi/.local/lib/python2.7/site-packages (from -r etc/requirements.txt (line 2))
Requirement already satisfied: colorama==0.3.5 in /home/jbyoshi/.local/lib/python2.7/site-packages (from -r etc/requirements.txt (line 3))
Requirement already satisfied: pystache==0.5.4 in /home/jbyoshi/.local/lib/python2.7/site-packages (from -r etc/requirements.txt (line 4))
Requirement already satisfied: requests==2.9.0 in /home/jbyoshi/.local/lib/python2.7/site-packages (from -r etc/requirements.txt (line 5))
Obtaining sponge_docs_theme from git+ (from -r etc/requirements.txt (line 6))
  Updating ./src/sponge-docs-theme clone
    Complete output from command python egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/home/jbyoshi/git/SpongeDocs/src/sponge-docs-theme/", line 6, in <module>
    AttributeError: 'module' object has no attribute '__version__'
Command "python egg_info" failed with error code 1 in /home/jbyoshi/git/SpongeDocs/src/sponge-docs-theme/

Does anyone know what’s going on?