feat(server): add path() and query() to Request

Closes #896 
Closes #897

BREAKING CHANGE: `RequestUri::AbsolutePath` variant is changed to a struct variant. Consider using `req.path()` or `req.query()` to get the relevant slice.

.travis.yml

@@ -22,7 +22,7 @@ script:
   - ./.travis/readme.py
   - cargo build --verbose $FEATURES
   - cargo test --verbose $FEATURES
-  - 'for f in ./doc/**/*.md; do rustdoc -L ./target/debug -L ./target/debug/deps --test $f;  done'
+  - 'for f in ./doc/**/*.md; do echo "Running rustdoc on $f"; rustdoc -L ./target/debug -L ./target/debug/deps --test $f;  done'
 
 addons:
   apt: