Merge branch 'release/0.1.0'
Merge branch 'release/0.1.1'
Merge branch 'release/0.1.2'
Merge branch 'release/0.1.3'
Fix progress counter update frequency (set to 100)
Set defaults to undef for $check_size, $check_content, and $verbose
Report (but don't die) if file sizes/contents don't match
Merge branch 'hotfix/0.1.4' into develop