Configure BSD Make for backward compat mode

Ensuring BSD Make is executed with the `-B` option (backward compat 
mode) allows many pieces of software to compile without `gmake`.
Merge pull request #68 from opscode-cookbooks/schisamo/bsd-make-backward-compat

Configure BSD Make for backward compat mode
Test RHEL 7 on ec2.
Guarantee presence of bzip2 on RHEL 7.