[installer] [host] fix the build for qt 4.8; qt 5 makes signals public by default
[installer] [host] we should use usbitcmd for this to avoid licensing
issues. Added a routine that will install usbit to a temporary path
[installer] [host] this shouldn't even be a bug. if a binary on windows
vista/7 has 'installer' in the name and it exits suddenly, you get a 'Did
this application install correctly' error if you don't implicitly declare
support in the manifest
[wordpress] add polylang plugin