* add failing test on header name fields insensitivity
* add some function to allow testing strings case insensitive
* modify functors MatchFirsts && MatchFirstWith to allow inject predicate
* Fix apiaryio/snowcrash#230
* header names are now compared in case insensitive way
* typo + refactring name of functor s/ContainersMatch/MatchContainers/ according to naming convenction
Merge pull request #240 from klokane/klokane/issue230-header-names-case-insensitivity

Klokane/issue230 header names case insensitivity