App doesn't run on el6

[ifireball]

AppImage binary seems to require a newer version of glibc. It probably needs to be somehow build against an older version.
Build system itself is yet to be tested on el6, that might solve this issue, but not in a manner that would allow building and releasing via Travis-CI

[probonopd]

Have a look at this:
https://github.com/probonopd/AppImageKit/tree/master/LibcWrapGenerator

I am using it with travis-ci:
https://github.com/probonopd/AppImageKit/blob/master/.travis.yml