When matching <small></small> in StringParser parenthesis should be excluded

- Do not insert optional parenthesis in the regex group
- Replace with empty string if content inside is empty
More descriptive naming in UriPolicy (#130)
change activeFor to applicableTo
Merge pull request #131 from jimkont/transliterate

More descriptive naming in UriPolicy (#130)
Merge pull request #125 from ninniuz/fix_small_tag_handling

When matching <small></small> in StringParser parenthesis should be excluded
Issue #133: Image files copyright is not analysed

Due to a typo in a for loop the ImageLinkRegex was not unapplied
on file articles.
Merge pull request #134 from ninniuz/133_fix_image_regex_for_loop

Issue #133: Image files copyright is not analysed