fix makefile failing when not in a git repo

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

cmd/ipfs/Makefile

 all: install
-commit = `git rev-parse --short HEAD`
+commit = $(shell git rev-parse --short HEAD 2> /dev/null || echo unknown)
 ldflags = "-X "github.com/ipfs/go-ipfs/repo/config".CurrentCommit=$(commit)"
 
 build:

repo/config/version.go

@@ -8,7 +8,7 @@ import (
 )
 
 // CurrentVersionNumber is the current application's version literal
-const CurrentVersionNumber = "0.3.8"
+const CurrentVersionNumber = "0.3.9-dev"
 
 // CurrentCommit is the current git commit, this is set as a ldflag in the Makefile
 var CurrentCommit string