Added escape() and unescape() methods for Net::Curl::Easy
Updated changelog and contributors list
Added support for CURLOPT_XFERINFOFUNCTION and CURLOPT_PROGRESSDATA
Updated changelog
Fixed version number check for escape() and unescape()
Guarded with ifdef CURLOPT_XFERINFODATA
Made escape() and unescape() more robust towards undef input and NULL output
Merge pull request #10 from davydovmax/master

Added support for escape(), unescape(), CURLOPT_XFERINFOFUNCTION and CURLOPT_XFERINFODATA