v1.3.0: Merge pull request #333 from tsloughter/rebar3

• Update to rebar3
• Update to latest erlydtl
• Add $ERL_LIBS to directories searched for applications
• Replace use of cut in extended start script with awk for Mac
• Replace -s init stop with halt() in scripts running erl
• Support symlink overlays in dev_mode
• Fix for tarring with overlay that copies to bin
• Support overlay file inclusion
• Use erl to determine hostname to be consistent with a running node
• Updates to windows extended start script

Thanks to @davidw @davebest @syl20bnr @jaydoane @surik @lrascao