directory structure change to work with glide

glide has its own requirements. My previous workaround caused me some
code checkin errors. Need to fix this.

weed/compress/delta_binary_pack32.go

@@ -0,0 +1,32 @@
+package compress
+
+import (
+	"github.com/reducedb/encoding/cursor"
+	"github.com/reducedb/encoding/delta/bp32"
+)
+
+// Compress compresses in[]int32 to out[]int32
+func Compress32(in []int32) (out []int32, err error) {
+	out = make([]int32, len(in)*2)
+	inpos := cursor.New()
+	outpos := cursor.New()
+
+	if err = bp32.New().Compress(in, inpos, len(in), out, outpos); err != nil {
+		return nil, err
+	}
+
+	return out[:outpos.Get()], nil
+}
+
+// Uncompress uncompresses in[]int32 to out[]int32
+func Uncompress32(in []int32, buffer []int32) (out []int32, err error) {
+	out = buffer
+	inpos := cursor.New()
+	outpos := cursor.New()
+
+	if err = bp32.New().Uncompress(in, inpos, len(in), out, outpos); err != nil {
+		return nil, err
+	}
+
+	return out[:outpos.Get()], nil
+}