* Split apart UnrecognizedEOF error variant from UnrecognizedToken
* Factor out fmt_expected function
* Initial attempt at fixing codegen
- Match on lookahead when returning error
- Use last fixed symbol as location of UnrecognizedEOF
- Use `Default::default()` when there are no fixed symbols (?)
* Initial implementation of finding latest optional location
* Fix UnrecognizedToken errors in `Some` test cases
* Fix UnrecognizedEOF test cases
* Fix parentheses around pattern error for 1.26 compatibility
* Add basic test for UnrecognizedEOF (and hopefully trigger Travis build)
* Fix emitted indentation and use travis_wait when testing
Instead we use --all-features to enable a special `test` feature to run tests with a freshly generated lrgrammar.rs. Since we also have a test to check that the saved lrgrammar.rs is identical to what lalrpop generates we should be ok with this approach.
Closes#436
