git/ci/test-documentation.sh, branch v2.13.2

travis-ci: check AsciiDoc/AsciiDoctor stderr output

2017-04-27T01:19:09Z

`make` does not necessarily fail with an error code if Asciidoc/AsciiDoctor encounters problems. Anything written to stderr might be a better indicator for problems. Ensure that nothing is written to stderr during a documentation build. The redirects do not work in `sh`, therefore the script uses `bash`. This shouldn't be a problem as the script is only executed on TravisCI. Signed-off-by: Lars Schneider Signed-off-by: Junio C Hamano

travis-ci: parallelize documentation build

2017-04-17T00:28:51Z

The documentation job without parallelization takes ~10min on TravisCI. With parallelization ("--jobs=2") it takes ~6min. Signed-off-by: Lars Schneider Signed-off-by: Junio C Hamano

travis-ci: build documentation with AsciiDoc and Asciidoctor

2017-04-17T00:27:56Z

ec3366e introduced a knob to enable the use of Asciidoctor in addition to AsciiDoc. Build the documentation on TravisCI with this knob to reduce the likeliness of breaking Asciidoctor support in the future. Signed-off-by: Lars Schneider Signed-off-by: Junio C Hamano

travis-ci: build documentation

2016-05-10T18:19:07Z

Build documentation as separate Travis CI job to check for documentation errors. Signed-off-by: Lars Schneider Signed-off-by: Junio C Hamano