Fix setup.py version import. It failed on clean install, since module supybot is not yet available.

When importing 'from src', that pulled src/__init__.py, which in turn tried to import the supybot module.
Now we edit sys.path and import the .py file directly.

setup.py

@@ -47,7 +47,10 @@ import glob
 import shutil
 import os.path
 
-from src.version import version
+# grab version from src directly, since we do not yet have supybot 
+# available as a module.
+sys.path.append('./src')
+from version import version
 
 plugins = [s for s in os.listdir('plugins') if
            os.path.exists(os.path.join('plugins', s, 'plugin.py'))]