Exit with shutdown when 'EXIT' shutdown is received.

Supervisor shutdown message should cause the handler
loop to exit with the reason shutdown.
Merge pull request #6 from cloudian/fix_shutdown

Exit with shutdown when 'EXIT' shutdown is received.
Add xrl_opts and yrl_opts to rebar.config
R16(A) support

Erlang/OTP R16 has done away with parameterized modules (see Issue 4
under http://www.erlang.org/news/35 for details).

Update ubf's internal implementation and dependencies to require a
parse transform for parameterized modules support (see
https://github.com/ubf/pmod_transform).
Update copyright
Update rebar (2.1.0-pre-64-g720d71e)
Deprecate R13B04
Add R16B travis target