Remove synchronous crate

It will be coming back! It's just going to involve a full rewrite and
removing it for now makes some of that restructuring easier.

Author: sfackler

.circleci/config.yml

@@ -34,6 +34,5 @@ jobs:
       - run: rustc --version > ~/rust-version
       - *RESTORE_DEPS
       - run: cargo test --all
-      - run: cargo test -p postgres --all-features
       - run: cargo test -p tokio-postgres --all-features
       - *SAVE_DEPS

Cargo.toml

@@ -1,11 +1,8 @@
 [workspace]
 members = [
     "codegen",
-    "postgres",
     "postgres-protocol",
     "postgres-shared",
-    "postgres-openssl",
-    "postgres-native-tls",
     "tokio-postgres",
     "tokio-postgres-native-tls",
     "tokio-postgres-openssl",