perltidy
Use File::Spec for getting the default temp directory
Simplify get_tmp_file
Update tests for get_tmp_file
Merge pull request #357 from ferki/tmpdir

Hi Ferki, looks good. Thank you.
added cloud_volume attach/detach
(David Golovan) - added tags, fix for multiple tags and undef instance name.
added description to environments - fixed #274
fixed unknown variable
README.pod -> README.md (with travis build status image)

Conflicts:
	README.md
display icon from build.rexify.org
Update README.md