Merge branch 'ls/p4-lfs'

Teach "git p4" to send large blobs outside the repository by talking to Git LFS. * ls/p4-lfs: git-p4: add Git LFS backend for large file system git-p4: add support for large file systems git-p4: check free space during streaming git-p4: add file streaming progress in verbose mode git-p4: return an empty list if a list config has no values git-p4: add gitConfigInt reader git-p4: add optional type specifier to gitConfig reader