We had the situation that "make test" runs the test suite but does not
show useful error messages (see
https://github.com/vgough/encfs/issues/358 for an example).
"make check" did the right thing by using the "--output-on-failure"
feature, but depended on "make test" being available as well. This
means users will continue to run "make test".
This commits drops the cmake test logic and adds a dumb "make test"
target that simply runs test.sh.
* Update cmake
* Update cmake, make Travis use it
* Enable all tests in a single command : make check
* Make cmake flawlessly run with Debian jessie cmake 3.0.2
* Make Travis use our own cmake 3.0.2 compiled version
* Typo in preferred version
* Be sure travis will have gettext
