* Simplify code in CurlMock cookbook recipe
* Link to latest versions of packages on hackage
* Fix grammar in the OpenIdConnect recipe
* HasForeignType -> HasForeign
- Almost everything 0.15; also servant-foreign jumped to 0.15, for
consistency
- Bump lower bounds of dependencies to most recent versions atm
- Use hspec-2.6.0
- Update `stack.yaml` accordingly
- Use base-compat a bit more
- Drop aeson-compat dependency (in tests and tutorial)