Now user can specify default param for optional field
Add extra test for default param
Use ruby old hash style
Add the record about the default optional param to CHANGELOG
Merge pull request #393 from niedhui/master

update changelog for #392
Update CHANGELOG.md
Fix: #394 - Path version no longer overwrites a  parameter.
Merge branch 'master' of github.com:oivoodoo/grape into oivoodoo-master
Documented optional params default value.
Use 1.9-style symbol keys in README
Merge pull request #401 from reprah/readme-hash-syntax

Use 1.9-style symbol keys in README