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Merge pull request #698 from asarturas/patch-1

Update index.md
Update ParamFetcher to handle UTF8 requirements

Added the 'u' modifier to the regex in cleanParamWithRequirements() so that parameters with UTF8 content will work with the regex.

Fixes #696
be less strict on jsonpvalidator version to be compatible with FOSJsRoutingBundle
Merge pull request #703 from uwej711/fix-dependency

be less strict on jsonpcallbackvalidator version to be compatible with FOSJsRout...
Merge pull request #702 from AntonStoeckl/param-fetcher-regex-utf8

Update ParamFetcher to handle UTF8 requirements
Allowed Constraint to be used on the requirements option on QueryParams and RequestParams