Use travis' native rust support (and build fuzztarget on travis)

.travis.yml

@@ -1,23 +1,18 @@
 language: rust
-sudo: false
+rust:
-
+  - stable
-matrix:
+  - beta
-  include:
+  - nightly
-    - rust: stable
+  - 1.14.0
-    - rust: beta
+cache: cargo
-    - rust: nightly
-
-install:
-  - |
-      pip install 'travis-cargo<0.2' --user &&
-      export PATH=$HOME/.local/bin:$PATH
 
 script:
-  - |
+  - cargo build --verbose --features=fuzztarget
-      travis-cargo build &&
+  - cargo build --verbose --features=rand
-      travis-cargo build -- --release &&
+  - cargo test --verbose --features=rand
-      travis-cargo test &&
+  - cargo build --verbose
-      travis-cargo test -- --release &&
+  - cargo test --verbose
-      travis-cargo bench &&
+  - cargo build --release
-      travis-cargo --only stable doc
+  - cargo test --release
-
+  - cargo bench
+  - if [ "$(rustup show | grep default | grep stable)" != "" ]; then cargo doc; fi