Solution: Use travis to deploy these artifacts automatically.

The deployment is triggered by tagging on the zeromq/libzmq repository.
Of the many builds travis is checking only the default one with
libsodium and drafts disabled is used for deployment.

For now the results of `make distcheck` are deployed as well as their
md5 and sha1 hash sums. Further changes may upload a generated
Changelog as well.

Solution: do default test with DRAFT APIs enabled

Solution: run make dist-check, which will run additional tests,
including making sure that the library is installable and the
distributable tarball is buildable, along with the usual make and
make check.

Solution: simply run make VERBOSE=1 check instead of manually
checking for return value and cat'ing the log file. With VERBOSE, on
error the log file will be automatically printed.

Solution: establish a matrix of CI options. On one axis we have the
build system (autotools, cmake, android) and on the other axis we
have the encryption options (tweetnacl, libsodium or none).

Solution: build by default with tweetnacl, and add sub-build project
to test libsodium

Solution: checkout stable branch instead.
Several warnings are printed when building from the master branch,
and developers recommend using the stable branch instead.

Solution: add `--depth 1` parameter to `git clone` commands

Currently, a test fails on Travis-CI but that can not be reproduced locally.
Without the contents of the test-suite.log, this is difficult to analyze.

Solution: print test-suite.log if "make check" fails

This is based on the following answer on SO:
http://stackoverflow.com/a/32597140

ldconfig is not available on OSX, so Travis CI build fails

Solution: Add qt-android build system and add to travis-ci