fixed ketarin xml file for dropbox to download only stable versions
autohotkey_l.portable as dependency for dropbox, code cleanups, more reliable autohotkey-script, reduced timeout to 60 s
reduced unnecessary high resolution of dropbox.png to 128 × 128 px and ran optipng -o7 over it
Merge pull request #48 from TomOne/dropbox-fix

Fixed ketarin xml file for dropbox to download only stable versions