add support for connection debugging
add support for a more verbose `error_string`
cleanup
unit test added for POSTing a send file
unit test impl simplified
#8: add support for CUSTOM requests
add unit test for final progress data
prepare coverity scans in travis CI config
prepare coverity scans in travis CI config
Merge branch 'master' of https://github.com/Kosta-Github/http-cpp
removed coverity_scan experiments again
Update .travis.yml