xdch47).

If we're editing a file in the "test" directory, the syntax checker
assumes we should use the 'test' profile and attempts to read from
"rebar.test.config" instead of "rebar.config". However, it is common to
have Erlang projects with tests that don't necessarily use a separate
"rebar.test.config" file, and in those types of projects the syntax
checker will break. This patch handles this case by falling back to
using "rebar.config" for tests if a separate "rebar.test.config" file is
not found.

…config-fallback

Fix Erlang checker for test files with no test cfg

Some linters("typecheck", "lll") need pacakge path to work.
These linters were supported by golangci-lint, however can't work
correctly in Syntastic with lacking of package path.