For getting webstorm fully install as a regular ubuntu app, 
and don't have to launch it with the script ./webstorm.sh 
add these webstorm.desktop in your /usr/share/applications/.
Don't forget to replace WEBSTORM_PATH by your webstorm absolute path

    [Desktop Entry]
    Type=Application
    Name=JetBrains WebStorm
    Exec=WEBSTORM_PATH/bin/webstorm.sh %f
    Icon=WEBSTORM_PATH/bin/webide.png
    Comment=Develop with pleasure!
    Categories=Development;IDE;
    Terminal=false
    StartupNotify=true
    StartupWMClass=jetbrains-webstorm