* Add support for HEAD requests to HttpClientConnection
* Allow to reuse disableSslVerify method, move it to HttpSupport
* Support LFS protocol and a file system based LFS storage
* Add com.google.gson 2.2.4.v201311231704 to target platform
* Implement SHA-256 abstraction
* DirCache: Do not create duplicate tree entries
* DirCacheEditor: Replace file-with-tree and tree-with-file
* AddCommand: Use NameConflictTreeWalk to identify file-dir changes
* Remove cached_packs support in favor of bitmaps
* Remove objects before optimization from DfsGarbageCollector
* Simplfy caching of DfsPackDescription from PackWriter.Statistics