use the generic TRAVIS environment var to check for travis (see http://docs.travis-ci.com/user/ci-environment/)
switch to C travis project instead of PHP
add initial install
Merge branch 'pull-request/932' into PHP-5.5

* pull-request/932:
  add initial install
  switch to C travis project instead of PHP
  use the generic TRAVIS environment var to check for travis (see http://docs.travis-ci.com/user/ci-environment/)