Build benchmarks on travis

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 /target
 /Cargo.lock
+/bench/bench

.travis.yml

@@ -20,6 +20,7 @@ env:
 script:
   - cargo build
   - cargo test
+  - make -C bench
   - cargo doc
 after_script:
   # the doc directory needs to be in the root for rust-ci

bench/Makefile

@@ -0,0 +1,11 @@
+all: bench
+
+bench: *.rs ../src/*.rs
+	(cd .. && cargo build)
+	rustc -L ../target --test bench.rs
+
+run: bench
+	./bench --bench
+
+clean:
+	rm bench