s/Reltool/Relx/
fix error messages
switch to drone.io for CI
allow multiple actions, including new action tar
better formatting from neotoma
set version to semver for rebar semver plugin
Merge pull request #29 from tsloughter/master

Tar action, multiple actions on cli and rename release dir
fix ternary shell operation in start script
Merge pull request #34 from tsloughter/master

fix ternary shell operation in start script
replace use of wildcard ** since it is not in <R16 Erlang
Merge pull request #36 from tsloughter/master

replace use of wildcard ** since it is not in <R16 Erlang
place release logs dir in root of release dir structure
Merge pull request #37 from tsloughter/master

place release logs dir in root of release dir structure
support copying full directories in overlays
Merge pull request #38 from tsloughter/master

support copying full directories in overlays
remove extend script overriding bindir variable after it is set
Merge pull request #39 from tsloughter/foreground_erts_fix

remove extend script overriding bindir variable after it is set
fix crash instead of error message for bad target action
only print usage on opt_parse error or new option -h
fix config option type in readme