Change quote to quote_plus and avoid double-escaping some problematic characters.
Fix ContentFile.decoded_content for Python 3.0 to 3.2
Merge branch 'fix_search_quoting' of https://github.com/cro/PyGithub into pr/237
Fix urlencoding for search (see #237)

Parameters are encoded in Requester => simply remove urllib.quote
Path needs to be encoded => change to urllib.quote_plus as in #237
Publish version 1.24.1