Currently, there is an ubuntu 14.04 and archlinux build and they both
use cmake with ninja, cmake with make, and autotools to build. It should
be straightforward to add another configuration.
Travis checks out the correct branch of the source code for us, and we
expose that source code to the docker container using a docker run
"volume".
To get the after_failure line work, I had to move the inline
build script to a separate script (util/travis-script.sh)
The second script (util/travis-after-failure.sh) will output
LastTest.log for cmake based builds and all files named
test*.log for an autotools based build.
Note: this commit also comes with a delibarate test failure
to illustrate the Travis behaviour. It will be removed in the
next commit.
This will run the different builds in parallel (depending on
resource availability on Travis).
The advantages are
- faster test results
- easier to spot which build type has failed
- shorter test log per build type to parse
- use more recent base system, which brings in a more recent gcc version
- install boost (currently 1.54)
- skip explicit installation of packages that were installed already
