* use only config to load modules, deprecate modules_dir parameter ([#78](https://github.com/fluencelabs/marine-rs-sdk-test/issues/78))
### Features
* use only config to load modules, deprecate modules_dir parameter ([#78](https://github.com/fluencelabs/marine-rs-sdk-test/issues/78)) ([b57fcc4](https://github.com/fluencelabs/marine-rs-sdk-test/commit/b57fcc4ab1b06396e3c3f28a8aa3a7157c98a71e))
- multi-service `marine_test` can now be applied to a `mod` instead of a `fn`
- added `generate_marine_test_env` function for generating `marine_test_env` in `build.rs`. It generates the same `marine_test_env` as the multi-service `marine_test` does and has similar interface. This will allow IDE support.
- added `include_test_env!` declarative macro for including generated `marine_test_env` in the project
Implemented the first part of [Issue 57](https://github.com/fluencelabs/marine-rs-sdk/issues/57): `marine_test` now can take several named services in attributes, then define interface to the services in `marine_test_env`.