[community] Potential issue using Lektor development server with python 2.7

Just a quick PSA for anyone building the DocsHackathon repositories locally. I ran into the following error on pages containing non-ASCII UTF-8 characters. ``` |UnicodeEncodeError: 'ascii' codec can't encode character u'\u201c' in position 86: ordinal not in range(128)| ``` If you run into this issue, try switching to Python 3 and reinstalling Lektor with the installation script.