Adding unzip and arg parsing.
added util.is_empty
adding is_number and is_string predicates
File decompression deals with both .gz and .tar.gz

Previously tar.gz would be treated as pure (non-tarred) gz
Allowed to read from undeclared _PROMPT.
Add a simple CSV writer and its unit tests
Move test to dedicated folder
Comment out obsolete tests
Ammend test into existing framework
Merge pull request #6 from jucor/CSVFile

Simple CSV export
Added reporting of object memory usage
Merge branch 'master' of git://github.com/rosejn/lua-util
Let the warn messages go to stderr.
Support scp protocol
Support scp protocol

Signed-off-by: Julien Cornebise <julien.cornebise@gmail.com>
Merge pull request #7 from fidlej/topic_warn_to_stderr

Let the warn messages go to stderr
Merge pull request #8 from jucor/scp

Support scp protocol
Merge branch 'master' of github.com:akfidjeland/lua-util
Merge branch 'master' of https://github.com/rosejn/lua-util