[BUGFIX beta] preserve base URL when using history location for routing
[beta] Remove reduceComputed-non-array-dependencies feature flags.
[beta] Remove ember-testing-lazy-routing feature flags.
[beta] Remove ember-testing-wait-hooks feature flags.
Merge pull request #4090 from rjackson/remove_feature_flags_for_1-3_features

[beta] Remove feature flags for 1.3 enabled features.
Merge pull request #3877 from matoilic/master

Preserve base URL when using history location for routing.