Added an update task for updating the versions/checksums.
Synced versions and checksums from ruby-versions@e0cba4bd8442b87775d6de18459628ff22196f2a
Added functions for querying versions.txt and stable.txt.
Added functions for querying checksums.* files.
Source functions at the top.
Move any functions using $ruby variables into functions.sh.
Decouple versions.sh functions from $ruby_dir.
Always echo -n.
Removed the verify function.
Added tests for checksums.sh.
Fixed typo.
Fixed typo.
Removed old md5sum/md5 detection test.
Used better names.
Use grep -q -x for BSD systems.
Add test for duplicate entries.
Load checksums.sh.
Added tests for versions.sh.
Default match to ""
Added another test for resolve_version.