What's new since 0.5.0 beta 1?

• Enabled support for clonebundles for faster clones when the server provides them.
• Git packs created by git-cinnabar are now smaller.
• Added a new git cinnabar upgrade command to handle metadata upgrade separately from fsck.
• Metadata upgrade is now significantly faster.
• git cinnabar fsck also faster.
• Both now also use significantly less memory.
• Updated git to 2.13.1 for git-cinnabar-helper.