fix tests

tests were crashing in travis afte lager has been added: goldrush and
its dependencies were not started.
remove couch
remove couch_collate
remove couch_dbupdates
remove couch_plugins
remove couch_replicator
remove couch_mrview
remove couch_index
remove couch_httpd
small update
fix deps url

tests on travis failed because deps aren't fetched.
make tests independant of the app location

user ERL_FLAGS instead of setting the path in the shebang
install applications in src/