Don't add __render_variables to custom tag vars.
Don't add __render_variables to custom tag vars.

It makes ChicagoBoss choke. Thanks @entronic for reporting.
The same effect can be had by passing a copy of the Variables with the RenderOptions.
Thanks @evanmiller for tip.

See pull request #83 for discussion.

The same effect can be achieved

quasiconvex/erlydtl,quasiconvex/erlydtl,wrw/erlydtl,huangered/erlydtl,alexr/erlydtl,aerosol/erlydtl,chaptastic/erlydtl,oxpa/erlydtl,truqu/erlydtl,A40in/erlydtl,project-fifo/erlydtl,wrw/erlydtl,A40in/erlydtl,campanja-forks/erlydtl,alexr/erlydtl,A40in/erlydtl,erlydtl/erlydtl,erlydtl/erlydtl,huangered/erlydtl,campanja-forks/erlydtl,chaptastic/erlydtl,alexr/erlydtl,aerosol/erlydtl,aerosol/erlydtl,truqu/erlydtl,kivra/erlydtl,project-fifo/erlydtl,kivra/erlydtl,chaptastic/erlydtl,campanja-forks/erlydtl,wrw/erlydtl,huangered/erlydtl,quasiconvex/erlydtl,oxpa/erlydtl,erlydtl/erlydtl,oxpa/erlydtl,truqu/erlydtl,kivra/erlydtl,project-fifo/erlydtl