Fix #205 (erlydtl:compile/3 returns warnings)

Adapt rebar_erlydtl_compiler to handle warnings emitted by
erlydtl:compile/3.
erlydtl: add missing clause (Reported-by: goofansu)

erlydtl implemented 'binary' option. Add new clause for {binary, false}.
Merge pull request #210 from tuncer/erlydtl-warnings

Fix #205 (erlydtl:compile/3 returns warnings)