Remove dependencies on lodash and pluralize

[gaearon]

I only now realized that these are dependencies. In general we try to pick projects with as least dependencies as possible for our Ecosystem packages. I don't think Lodash dependency is justified here, as it increases bundle size for a few utility functions.

Unfortunately I couldn't figure out how to fix the linter to not complain about usage of built-in functions. I understand if you don't want to take this, but unfortunately we can't officially recommend a package that brings in the whole Lodash for the sake of combineReducers().

[gajus]

Ignore the merge conflicts – did not see the PR before removing the pluralize dependency. Will fix the merge conflicts myself.

[gajus]

Thank you for the PR @gaearon.

[gajus]

Version 3.0.2 released and incorporates all these changes.

[mxstbr]

Fresh install of 3.0.2, getting the following error:

/~/redux-immutable/dist/combineReducers.js
Module not found: Error: Cannot resolve module 'lodash/forEach'

EDIT: #17