v0.4.1

Apollo Android v0.4.1

• Fix logic in apolloclient build when using callFactory (#591)
• Prepare for Optimistic update store (#584)
• Make NormalizedCache to be chained (#596)
• Add a method to merge a single Record to the store. (#604)
• Introduce OptimisticNormalizedCache and API to write/rollback (#607)
• Rename to mutationId and fix issue with partial optimistic store (#611)
• Mutation public API with optimistic updates (#613)
• Replace hardcoded separator with File.separator (#616)
• Attach X-APOLLO-OPERATION-ID http header to all network requests (#619)
• Introduce record version history for optimistic store (#618)
• Treat ID as custom scalar type (#620)
• Generate data model builder (#622)
• Fix Cache not working when fields have null values (#624)
• Fix issue with NetworkOnMainThreadException (#625)
• Fix FindBugs issue of passing nullable fragment as an argument (#626)
• Fix code generation for Fragments Mapper with Nullable annotations (#630)
• Add support of field conditions (#631)
• Fix windows file separator handling (#634)
• Add support directives to cache field resolver (#635)