Run test in release mode

Tests were pretty slow before.
Additionally, this commit fixes the indentation of .travis.yml and does also
run `cargo test` in Travis.

.travis.yml

@@ -9,5 +9,6 @@ matrix:
         - rust: nightly
     include:
         - rust: nightly
-          script:
-              - cargo bench
+script:
+  - cargo bench
+  - cargo test --release

appveyor.yml

@@ -14,4 +14,4 @@ install:
 build: false
 
 test_script:
-  - cargo test --verbose
+  - cargo test --release --verbose