fixed exceptions classes
added stateless method ToInlineStyleEmailConverter::inlineCSS($html, $css)
twig tag `inlinecss`
updated readme
Merge branch 'twig-tag' of github.com:mente/ToInlineStyleEmailBundle into twig-tag

* 'twig-tag' of github.com:mente/ToInlineStyleEmailBundle:
  removed redundant include in composer example