Version bump to 0.5.0.
Added the --system option for installing into /usr/local (closes #141).
Add option not to extract tarball
Make --no-extract imply --no-download and --no--verify
Use anyway over the colloquial anyways.
Fix maglev/checksum sha filenames.
Merge pull request #172 from jrafanie/anyways

Use anyway over the colloquial anyways.
Merge pull request #162 from samrees/add_no-extract

Add option not to extract tarball
Show the algorithm in checksum warnings and errors.
Merge branch '0.5.0'
Added a missing test for --no-extract.