auto-detect package path of gpm, so binary can be put in any path that is in /c/Users/Unknown/bin:.:/usr/local/bin:/mingw/bin:/bin:/c/Program Files/Common Files/Microsoft Shared/Windows Live:/c/Program Files (x86)/Common Files/Microsoft Shared/Windows Live:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/c/Program Files (x86)/Windows Live/Shared:/c/Program Files/Intel/WiFi/bin/:/c/Program Files/Common Files/Intel/WirelessCommon/:/c/Program Files/Microsoft/Web Platform Installer/:/c/Program Files (x86)/Microsoft ASP.NET/ASP.NET Web Pages/v1.0/:/c/Program Files (x86)/Windows Kits/8.0/Windows Performance Toolkit/:/c/Program Files/Microsoft SQL Server/110/Tools/Binn/:/d/TortoiseHg/:/d/Qt/Qt5.0.1/5.0.1/msvc2010/bin:/d/Java/jdk1.7.0_17/bin:/d/Java/jdk1.7.0_17/jre/bin:/d/MinGW64/bin:/d/MinGW/bin:/c/Program Files/MySQL/MySQL Server 5.1/bin:/d/go/bin:/cmd:/bin:/e/Go/Development/src/github.com/GPMGo/gpm