fix(ts-webpack): fix missing entries in typings
fix(ts-webpack): fix missing entries in typings

Prevents TS2307 errors (missing modules) when compiling TypeScript.

closes #400

wallabyjs/skeleton-navigation,niieani/skeleton-navigation-typescript,niieani/skeleton-navigation-typescript,ahmedshuhel/skeleton-navigation,aaronroberson/skeleton-navigation,niieani/skeleton-navigation-typescript,ahmedshuhel/skeleton-navigation,wallabyjs/skeleton-navigation,aaronroberson/skeleton-navigation,niieani/skeleton-navigation-typescript,wallabyjs/skeleton-navigation,ahmedshuhel/skeleton-navigation,wallabyjs/skeleton-navigation,ahmedshuhel/skeleton-navigation,aaronroberson/skeleton-navigation,aaronroberson/skeleton-navigation