Made Foxx RequestContext bodyParam more consistent with other param methods. Fixes #935.
Added tests.
Undocumented body param now uses new syntax.
Added old requestContext.bodyParam to DEPRECATED.md.
Removed deprecation warning for now.
Merge pull request #940 from triAGENS/foxx-fancier-body-param

Foxx: more consistent bodyParam (fixes #935)