#159 (take 2): use "TiddlyWikiOptions" cookiename

cookie is read from both "TiddlyWiki" and "TiddlyWikiOptions" (use the
2nd, if present).  Cookie is saved to both names (preserves old
functionality, so that if cookies with quotes were ok before, they still
work now.
update version info for TW290b2 release
#159 (take 3): fixed fallback handling for old "TiddlyWiki" cookie

#159 (take 3): only read old "TiddlyWiki" cookie if newer
"TiddlyWikiOptions" cookie is not present
Merge pull request #169 from ericshulman/master

Use TiddlyWikiOptions cookiename for TW290 and above