V4 changes to make external usage easier

[Claudenw]

Fix for #276 and #279 on V4

This change:

• Adds a public String source() method to MatchPattern to return the "source" instance value.
• Makes public MatchPattern method static String[] tokenizePathToString(String path, String separator)
• Adds public List sources() method to MatchPatterns that to return a list of MatchPattern.source() for each enclosed pattern.
• Makes public SelectorUtils static boolean isAntPrefixedPattern() method
• Makes public SelectorUtils static boolean isRegexPrefixedPattern() method
• Adds a SelectorUtils public static String extractPattern(final string pattern, final String separator) method to extract a simplified pattern without the Ant or Regex prefix and with the Ant path modified by a call to toOSRelatedPath to ensure that it is properly formatted.