Update appveyor to test subcrates.

appveyor.yml

@@ -28,6 +28,8 @@ build: false
 # TODO modify this phase as you see fit
 test_script:
   - cargo test --verbose
+  - cargo test --verbose --manifest-path grep/Cargo.toml
+  - cargo test --verbose --manifest-path globset/Cargo.toml
 
 before_deploy:
   # Generate artifacts for release