fix double include_erts call with vm.args and sys.config config vars
by default do not do app and release discovery under output dir
update travis build command
unset REBAR target when building on travis; ensure latest rebar
setting REBAR to the rebar in the current directory works
Merge pull request #134 from nuex/travis_rebar

Ensure latest rebar is fetched when building on Travis-CI
Merge pull request #124 from tsloughter/master

2 fixes
Honor LD_LIBRARY_PATH settings in start scripts

The start scripts export the LD_LIBRARY_PATH environment variable to "$ERTS_DIR/lib". They should honor existing LD_LIBRARY_PATH required e.g. for running ports.
Merge pull request #135 from hirschenberger/master

Start scripts should honor existing LD_LIBRARY_PATH settings