So just go here : http://docs.ansible.com/ansible/intro_installation.html#latest-release-via-yum
... and follow the part that starts :-
'You can also build an RPM yourself. From the root of a checkout or tarball, use the make rpm command to build an RPM you can distribute and install. Make sure you have rpm-build, make, asciidoc, git, python-setuptools and python2-devel installed......'
This blog is also somewhat useful :-
http://mangolassi.it/topic/7506/installing-ansible-2-on-centos-7/2
HTHs
Fraser.