* Refactored caching connectors into their own packages
- apollo-server-caching (exports interface for KeyValueCache)
- apollo-server-caching-memcached
- apollo-server-caching-redis
One issue now is that there is duplication of mocks and test code in each of the packages. It would be better if we had centralized integration tests for all cache connectors, community contributed or otherwise.
* export test suite for cache connectors from `apollo-server-caching`
* fixed tsconfig.json
* added @types
* Enable declarationMap in tsconfig.json
See http://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-9.html
* Add apollo-server-caching package and improve typings
* Remove superfluous test steps
* Add .npmignore to apollo-server-caching
* Add apollo-server-env and apollo-datasource-rest packages
* Fix broken imports
* Use prepublish instead of prepare
* cache is now passed to data sources from ApolloServer constructor
* fix Object.values to use the object passed in rather than this
* add initial datasource test
* docs: initial data source documentation
* docs: initial data source documentation
* compiles and documentation now highlights code in data-sources.md
* Some changes to the data source docs
