bugfix for empty configs in the Erlang API
move discovered releases to their own area of the relcool state
support shared resoure as far as discovery goes

also correctly handles symlinks without infinite loops
fix bug in rebuild rule of makefile
fix bug in release override test suite
replace erl sript in copied erts with generated version
copy start_clean boot file along with erts
update do type spec for undefined config
change to release rootdir to run release
add crash dump to git ignore
add extended start script
add extended_start_script to example relcool config
add contributing document