Add relx improvements

Add ability to config relx in-line options by setting RELX_OPTS
Fix using RELX_CONFIG variable
Use relx 0.5.0
Merge branch 'master' of git://github.com/kaos/erlang.mk
Bump relx version to 0.5.2
Changed \s pattern in sed regex pattern to [[:space:]]. This should make the sed pattern portable across GNU and BSD implementations.
Add --no-check-certificate to wget to make it work on default OSX
Merge branch 'master' of git://github.com/kiela/erlang.mk
Merge branch 'master' of git://github.com/NineFX/erlang.mk
Append DEPS_DIR at the end of ERL_LIBS if ERL_LIBS is defined

Only done if DEPS_DIR isn't found in it yet.

Thanks to Sean Chalmers for the debugging and original fix.
Add CT_OPTS
Add DIALYZER_PLT variable

This is useful for optionally sharing a PLT amongst projects or
dependencies.
Update relx to the latest version
Change erlydtl call to work with old and new releases
Merge branch 'dialyzer-plt-variable' of git://github.com/danielwhite/erlang.mk
Update copyright years
Merge branch 'fix_dtl_compilation' of git://github.com/acammack/erlang.mk
Merge branch 'update_relx' of git://github.com/acammack/erlang.mk
Add TEST_ERLC_OPTS option
Update erlydtl url.
Add proper to package list.