refactor: change _extend to $$defineMethod
fix: instance warning
refactor: move config/createScript into closure
feat: allow either Intercom or $intercom
feat: more comments
docs(changelog): update to 2.0.1
docs(readme): more comments
chore: bump version 2.0.1
Merge pull request #17 from gdi2290/refactor

Refactor for 2.0.1