* Add an off-by-default 'unstable' flag
* Remove explicit web framework feature names
Having forgotten that deps and features can't have the same name,
attempts to better document all the features in one place were
misplaced.
* Split up tests on Travis
`cargo test` doesn't allow `--workspace` and `--features`
simultaneously, so we're forced to test each package separately in order
to manually specify features (or in this case, test everything but
unstable)
* Update Travis Config
- Document the state of Cargo workspaces and features
- Update the benchmarks to trickle down the 'unstable' feature
* Use `std::matches!`
- Remove crates.io `matches` in favor of the `std` version
- Fix Clippy warning by changing a `match ... { ... }` to
`matches!(...)`
* Satisfy `blocks_in_if_conditions`
Use of liquid::Object instead of liquid::Context and use of
Value::scalar instead of Value::Str and Value::Num. Changes to how the
parse() method is called.
