fixing doc conf.py for rtfm without catkin_pkg

doc/conf.py

@@ -15,12 +15,8 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 
-## get catkin package information
-import os
-import catkin_pkg.package
-catkin_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-catkin_package = catkin_pkg.package.parse_package(
-    os.path.join(catkin_dir, catkin_pkg.package.PACKAGE_MANIFEST_FILENAME))
+with open('../pyros-setup/_version.py') as vf:
+    exec(vf.read())
 
 # -- General configuration ---------------------------------------------------
 
@@ -57,9 +53,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = catkin_package.version
+version = __version__
 # The full version, including alpha/beta/rc tags.
-release = catkin_package.version
+release = __version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.