Merge pull request #88 from AndrewEdwards/master

Improve versioning
Fix missing dmd prefix.
replace deprecated std.zip.ArchiveMember.madeVersion with fileAttributes

- unconditionally replace backslashes
fix fetching old DMD version

- use git describe to find ancestor release

- add runCapture (returns command output as string)
Merge pull request #90 from MartinNowak/fixFileAttributes

replace deprecated std.zip.ArchiveMember.madeVersion with fileAttributes
Merge pull request #91 from MartinNowak/fixOldDMD

fix fetching old DMD version