fix head requests, allow custom ua, prepopulate File->cache_data
bump widget version, add changelog
update changelog
reference widget's changelog
get rid of inane constants
set version to 1.0.5
Merge branch 'version-1.0.5' of github.com:uploadcare/uploadcare-php into version-1.0.5
Merge pull request #15 from uploadcare/version-1.0.5

Version 1.0.5