build: make sure all relevant files are processed during install

MANIFEST.in

@@ -1,16 +1,23 b''
 # top level files
 include *.rst
 include *.txt
 
 # package extras
 include vcsserver/VERSION
 
+# all python files inside vcsserver
+graft vcsserver
+
 # all config files
 recursive-include configs *
 
 # hook templates
 recursive-include vcsserver/hook_utils/hook_templates *
 
 # skip any tests files
 recursive-exclude vcsserver/tests *
 
+recursive-exclude docs/_build *
+recursive-exclude * __pycache__
+recursive-exclude * *.py[co]
+recursive-exclude * .*.sw[a-z]