add config for travis-ci
  * tests against erlang R16B02, R16B01, R15B03, and R15B02
  * 'install' phase downloads neo4j 2.0.0, unpacks and
    sets ERBI_TEMP_DB_BIN_NEO4J env var
fix bad case clause in find_bin_dir
remove use of application:ensure_started/1
use system rm to delete files