isLocal() to calc useJavaSaver and readOnly flags

new function, isLocal(), is used for "check for file:// URL" test when
calculating useJavaSaver and readOnly flags.
update version/date for TW281 beta 2
Merge pull request #140 from ericshulman/master

added isLocal() test function for calculating  'useJavaSaver' and 'readOnly' flags