Couple of improvements and cleanup.

+ Include directories are automatically added based on nearby Cargo.toml files (This generally just means that imports work like you'd expect)
+ Type filters
+ Type attributes

examples/shared/build.rs

@@ -1,12 +1,10 @@
-use gin_tonic::{BuildEnvironment, Compiler};
-use std::path::PathBuf;
+use gin_tonic::Compiler;
 
 pub fn main() -> Result<(), Box<dyn std::error::Error>> {
-    Compiler::new(BuildEnvironment::new()?)
-        .include([PathBuf::from("../..")])
+    Compiler::new()
         .with_well_known_types()
-        .add_proto_files(["proto/example.proto"])
-        .compile(Some("./src"))?;
+        .add_proto_file("proto/example.proto")
+        .compile_into("./src")?;
 
     Ok(())
 }