enable OSX build
there is no sshpass on brew due to security reason

if we do need it, we have to build it ourselves
use gnureadlink on osx, fix #100
Merge branch 'master' of https://github.com/umlaeute/Gem

Conflicts:
	.travis.yml
	build/travis-ci/build.sh
enalbe OSX build, update name/github login
revert unhappy merge
something more to revert ?
script-snippet to be included by travis-scripts
simplified travis/build.sh by using common.source
Merge remote-tracking branch 'avilleret/master'

Conflicts:
	build/travis-ci/build.sh
default BUILDDIR
simplify build-script

OSX arch-builds (64bit, 32bit) shall be handled via the
buildmatrix where ARCH is set to "i386" (or "x86_64", or nothing).

linux builds for non-supported archs should be excluded (in the matrix)
print ARCH
ARCH-dependent builds (via matrix)

and exclude linux/i386 build from matrix