Update Cache.podspec

Merge pull request hyperoslo#43 from hyperoslo/feature/config-for-jso…

…n-serialization

Feature/config for json serialization

Update Cache.podspec

Merge pull request hyperoslo#35 from hyperoslo/feature/sync-cache

Feature: sync cache

Merge pull request hyperoslo#34 from hyperoslo/bugfix/cannot-save-fil…

…e-with-long-URL-key

Bugfix/cannot save file with long URL key

Update Cache.podspec

Merge pull request hyperoslo#28 from hyperoslo/fix/tests

Fix Expire date issues that screwed up tests on older devices.