Add PR template and compile examples in CI (#1014)

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,2 @@
+- [ ] Added an entry to `CHANGELOG.md` if knowledge of this change could be valuable to users
+- [ ] Updated documentation to reflect any user-facing changes

.travis.yml

@@ -23,6 +23,8 @@ addons:
 
 script:
     - cargo test --all -j 1
+    - cd examples
+    - cargo build
 
 after_success:
     - |