Convert 3 more new packages to PythonPackage (#2841)

var/spack/repos/builtin/packages/py-sphinx-bootstrap-theme/package.py

@@ -25,7 +25,7 @@
 from spack import *
 
 
-class PySphinxBootstrapTheme(Package):
+class PySphinxBootstrapTheme(PythonPackage):
     """Sphinx Bootstrap Theme."""
 
     homepage = "https://pypi.python.org/pypi/sphinx-bootstrap-theme/"
@@ -33,9 +33,4 @@ class PySphinxBootstrapTheme(Package):
 
     version('0.4.13', '32e513a9c8ffbb8c1e4b036e8f74fb51')
 
-    extends('python')
-
     depends_on('py-setuptools', type='build')
-
-    def install(self, spec, prefix):
-        setup_py('install', '--prefix={0}'.format(prefix))