[RAINCATCH-1182] Fix loglevel compile issue

[paolobueno]

Motivation

Fix compilation issues from hybrid hoisting and non-hoisting bootstrapping via using the core and angularjs repos together.

Description

Use the loglevel library untyped, copy over relevant enum.

This should fix the compilation issues without changing the logger's public library.

[paolobueno]

To verify:

• Run lerna bootstrap from core/ linked inside the angularjs repo
• Run lerna bootstrap from the angularjs repo above in the filesystem structure
• Run lerna run build from the angularjs repo, it should also compile the logger module correctly

[coveralls]

Changes Unknown when pulling c06efe7 on RAINCATCH-1182 into ** on master**.

[wtrocki]

Verified