Delete extra whitespace
Order defines in increasing libcurl version order
CURL_SEEKFUNC_CANTSEEK requires libcurl 7.19.5+
Add CURLE_NOT_BUILT_IN, CURLE_FTP_ACCEPT_FAILED, CURLE_UNKNOWN_OPTION
Implement a CURLE_UNKNOWN_OPTION guard for test cases requiring libcurl to be built against certain libraries
Add CURLOPT_SSH_KNOWNHOSTS
Credit Markus and decitre for python 3 patches
Link to stack overflow for support
Note that vsftpd is needed for the test suite
Document python version requirement for official binary packages on windows, fixes #183