Restore CentOS/RHEL 5 omnibus support.
Restore CentOS/RHEL 5 omnibus support.

Now that we require node v0.8, CentOS 5 build environments must have
python 2.6 in order to successfully build node.  The simplest
method to do this is documented at https://gist.github.com/theturtle32/3178637

sean-/nad,esproul/nad,hjhart/nad,maier/nad,keithf4/nad,esproul/nad,HeinrichHartmann/nad,hjhart/nad,HeinrichHartmann/nad,esproul/nad,hjhart/nad,HeinrichHartmann/nad,circonus-labs/nad,keithf4/nad,maier/nad,HeinrichHartmann/nad,esproul/nad,esproul/nad,sean-/nad,sean-/nad,maier/nad,maier/nad,hjhart/nad,circonus-labs/nad,HeinrichHartmann/nad,sean-/nad,circonus-labs/nad,keithf4/nad,hjhart/nad,circonus-labs/nad,circonus-labs/nad,maier/nad,HeinrichHartmann/nad,maier/nad,sean-/nad,keithf4/nad,circonus-labs/nad,keithf4/nad