Coverage exclude

[remnev]

Fixes #36

[coveralls]

Changes Unknown when pulling 14f21a5 on coverage-exclude into * on master*.

[coveralls]

Changes Unknown when pulling 5f6e83d on coverage-exclude into * on master*.

[qfox]

Not sure we need to simplify enb config because we need to integrate tests/specs for js and docs soon. Are you?

[remnev]

@zxqfox I think this config is ok now. And we need to get issues, which you're talking about.
To start with simply config and go ahead with new features and modify that simply config — is ok way I think.