fix(exports): Rearreange main module export
fix(exports): Rearreange main module export

To fix some issues with generated webpack exports in Ionic 2

closes #75

gund/ng2-http-interceptor,gund/ng-http-interceptor,gund/ng2-http-interceptor,gund/ng-http-interceptor,gund/ng-http-interceptor,gund/ng2-http-interceptor