Revision21 released

Latest released frej.jar includes few important features (since previous "news" article):
- single line comments in patterns (from "//" to end of line);
- fix for error with escaped brackets (now all bracketing, escaping and spacing works perfect);
- implementation info (with version number, though it is not automated) in the manifest.mf;
- adjustable threshold for Regex.

So this release could be regarded as functional and stable. Though javadocs still waits for actualization.