MacOS X doesn't have '/bin/true'
Revert "Travis config trial: git config --global"

Avoids messing with global config when running the script
manually on a developer machine.

This reverts commit 6225092355e3087c3e73928f54cc1073c55067d6.
travis-doxygen.sh: allow overriding GitHub repo from environment
travis-doxygen.sh: try to explicitly implement an empty GIT_ASKPASS
travis-doxygen.sh: directly setup .git-credentials

Instead of fiddling with the non-working GIT_ASKPASS/core.askpass
setup, simply store the required Git credentials directly in
~/.git-credentials, which is used by Git's "store" credential helper.

Works on https://travis-ci.org/pah/rapidjson.
travis-doxygen.sh: don't ignore Doxygen push error
Merge pull request #68 from pah/travis-ci

Fix uploading Doxygen documentation to GH pages from Travis CI