Update to XBlock version that installs workbench packages.

requirements/base.txt

 # edX Internal Requirements
--e git+https://github.com/edx/XBlock.git@8eb2c4a02b#egg=XBlock
+git+https://github.com/edx/XBlock.git@1d228943#egg=XBlock
 
 # Third Party Requirements
 django==1.4.8

requirements/dev.txt

-# Grab everything in test (which pulls everything in base)
 -r test.txt
 
 # Debug tools

setup.py

@@ -27,7 +27,7 @@ def is_requirement(line):
     line = line.strip()
 
     # Skip blank lines, comments, and editable installs
-    return not (line == ''  or line.startswith('#') or line.startswith('-e'))
+    return not (line == ''  or line.startswith('#') or line.startswith('-e') or line.startswith('git+'))
 
 
 REQUIREMENTS = [