Fix travis builds

[viddrobnic]

After the newly written encryption we are linking the libraries statically. Travis builds have not been changed, so the builds that they produce are invalid.

[zigapk]

Travis build script was partialy rewriten and produces valid binaries, however packaging (appimage) still has to be fixed.

[matejm]

Currently Travis does not produce any valid binaries. Following binaries have to be provided:

• deb package
• rpm package
• AppImage, tracked in issue AppImage is not build in travis #40
• Arch package, see also arch-packages repository
• Mac OS package, as travis also supports Mac OS builds. Tracked in Mac os package #28
• Windows package, see also non-linux-packages repository