Support specifying a key conversion function for keywords in generators.
Use keyword conversion in maps, too.
Fix namespaced keyword conversion, add test and benchmark.
Avoid performance penalty on encoding when key-fn is not specified.
Don't apply key-fn to keywords which are values.
Merge remote-tracking branch 'goodwink/support-key-conversion-in-generate'
run core benchmarks longer
whitespace and formatting fixes
add alias to run only benchmark for core
update changelog
update .gitignore
Release 5.1.0