Add cid lib and deps.

Note: I am not very pleased with how many deps this core and simple
data type has.  These are basically all for the hashing, and very, very
little actual hashing code at that, and I really wish the rule about
"a little vendoring is better than a little dependency" would be
applied here -- pulling in x/crypto and x/sys so that I can use a
type that's *a wrapper around string* is thoroughly ridiculous.
Signed-off-by: Eric Myhre <hash@exultant.us>

.gitmodules

 [submodule ".gopath/src/github.com/polydawn/refmt"]
 	path = .gopath/src/github.com/polydawn/refmt
 	url = https://github.com/polydawn/refmt
+[submodule ".gopath/src/golang.org/x/sys"]
+	path = .gopath/src/golang.org/x/sys
+	url = https://go.googlesource.com/sys
+[submodule ".gopath/src/golang.org/x/crypto"]
+	path = .gopath/src/golang.org/x/crypto
+	url = https://go.googlesource.com/crypto
+[submodule ".gopath/src/github.com/ipfs/go-cid"]
+	path = .gopath/src/github.com/ipfs/go-cid
+	url = https://github.com/ipfs/go-cid
+[submodule ".gopath/src/github.com/multiformats/go-multibase"]
+	path = .gopath/src/github.com/multiformats/go-multibase
+	url = https://github.com/multiformats/go-multibase
+[submodule ".gopath/src/github.com/multiformats/go-multihash"]
+	path = .gopath/src/github.com/multiformats/go-multihash
+	url = https://github.com/multiformats/go-multihash
+[submodule ".gopath/src/github.com/minio/sha256-simd"]
+	path = .gopath/src/github.com/minio/sha256-simd
+	url = https://github.com/minio/sha256-simd
+[submodule ".gopath/src/github.com/minio/blake2b-simd"]
+	path = .gopath/src/github.com/minio/blake2b-simd
+	url = https://github.com/minio/blake2b-simd
+[submodule ".gopath/src/github.com/gxed/hashland"]
+	path = .gopath/src/github.com/gxed/hashland
+	url = https://github.com/gxed/hashland
+[submodule ".gopath/src/github.com/mr-tron/base58"]
+	path = .gopath/src/github.com/mr-tron/base58
+	url = https://github.com/mr-tron/base58
+[submodule ".gopath/src/github.com/spaolacci/murmur3"]
+	path = .gopath/src/github.com/spaolacci/murmur3
+	url = https://github.com/spaolacci/murmur3
+[submodule ".gopath/src/github.com/whyrusleeping/base32"]
+	path = .gopath/src/github.com/whyrusleeping/base32
+	url = https://github.com/whyrusleeping/base32

hashland @ d9f6b97f

+Subproject commit d9f6b97f8db22dd1e090fd0bbbe98f09cc7dd0a8

go-cid @ 6e296c5c

+Subproject commit 6e296c5c49ad84dc6a44af69fa1fe4e1245cd0cf

blake2b-simd @ 3f5f724c

+Subproject commit 3f5f724cb5b182a5c278d6d3d55b40e7f8c2efb4

sha256-simd @ 51976451

+Subproject commit 51976451ce1942acbb55707a983ed232fa027110

base58 @ 89529c69

+Subproject commit 89529c6904fcd077434931b4eac8b4b2f0991baf

go-multibase @ bb91b53e

+Subproject commit bb91b53e5695e699a86654d77d03db7bc7506d12

go-multihash @ 97cdb562

+Subproject commit 97cdb562a04c6ef66d8ed40cd62f8fbcddd396d6

murmur3 @ f09979ec

+Subproject commit f09979ecbc725b9e6d41a297405f65e7e8804acc

base32 @ c30ac306

+Subproject commit c30ac30633ccdabefe87eb12465113f06f1bab75

crypto @ 0c41d7ab

+Subproject commit 0c41d7ab0a0ee717d4590a44bcb987dfd9e183eb

sys @ 8e24a49d

+Subproject commit 8e24a49d80f82323e1c4db1b5da3e0f31171a151