updated travis config following http://genbattle.bitbucket.org/blog/2016/01/17/c++-travis-ci/
updated travis config following http://genbattle.bitbucket.org/blog/2016/01/17/c++-travis-ci/

evoldoers/historian,evoldoers/historian,evoldoers/historian,evoldoers/historian,evoldoers/historian,evoldoers/historian