Improve architecture detection

[pschichtel]

Instead of using using Java's os.arch property to detect the platform architecture, it might be more precise to read /proc/cpuinfo or lspci's output. Having the os.arch-based detection as a fallback is probably still a good idea.

This should improve detection of the various ARM architectures and help with #24 and #30

[pschichtel]

Since architecture detection is really messy without external tools I'm thinking about dropping architecture detection completely and instead deploying single architecture versions with a classifier per architecture

[pschichtel]

Dropped the detection in favor of a jar per architecture