* update for reorganized headers in gRPC v1.1: https://github.com/grpc/grpc/pull/7559
* update nix files
* rename all gpr_slice to grpc_slice since we can't be backwards compatible anyway
* use gRPC 1.1.4
* now compatible with gRPC 1.2.0
* use nixpkgs 17.03 to get protobuf3_2, newer proto3-* deps, fix some warnings
* another warning
* Update `proto3-suite` gitrev in `stack.yaml` to `8db2ceb8c48a3f8dc2cbdc492d1e8cbaf8b62a15`
* Update `proto3-suite` gitrev in `nix/proto3-suite.nix` to `8db2ceb8c48a3f8dc2cbdc492d1e8cbaf8b62a15`
* Regenerate `Echo.hs` via new `proto3-suite` + `compile-proto-file`
* Remove additional warnings
* Use GRPC v1.01 (grpc-1.0.1-6040b47)
* Minor tweaks to GRPC request result processing (less exact matching on some StatusDetails due to GRPC rev bump)
* Update tests.patch
* release.nix fixes for building and running cabal test suite from inside the nix-shell environment
* Update build instructions
* More README updates
* Fix stack tooling and improve documentation
* Update grpc sha256, cleanup build instructions
* Whups, DYLD_LIBRARY_PATH and substituteInPlace is still needed for hydra / macos builds with no brew-installed grpc!
* PR feedback tweaks
This updates the `release.nix` to now correctly run the test suite. You can
now build and test `grpc-haskell` by running:
```
$ nix-build -A grpc-haskell release.nix
```
... and `nix-shell` has been updated, too, so that you can do `cabal`
development inside of a `nix-shell` by running:
```
$ nix-shell -A grpc-haskell.env release.nix
```
For people who prefer to use `stack` you can still just build the `grpc`
library by running:
```
$ nix-build -A grpc release.nix
```
... then pass that library as input to `stack`
