Experimental Embedded Elixir support.

EEx files should end in ".eex".

Also created a template adapter system for handling more template
engines in the future.
Adding template adapters
Update docs on EEx (i.e., how to loop)
Get rid of process dict calls for EEx.

Thanks to Jose Valim for Elixir-side patches
Compile src/lib/*.ex as Elixir libraries
Fix non-master nodes
vm_name => {vm_name, vm_sname}
Fix -name/-sname stuff
Allow string for "master_node" config option
Fix configs w/o vm_name
Return non-syntax errors from compilation
Don't lie about an error being in production