Unify build properties.
- Switch all system properties to project properties.
- Use the ``javaLocalNamingStyle`` instead of the
``dot.delimited.style`` for property names, so that it can be directly
referenced by ``rootProject.propertyName``.
- Recommend users to put GRPC-specific properties in project-level
``build.properties`` instead of the user-level.
diff --git a/.gitignore b/.gitignore
index 2a18d55..89e2e50 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
# Gradle
build
+gradle.properties
.gradle
# IntelliJ IDEA