emoji: update spec for combination unicode

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

README.md

@@ -85,7 +85,7 @@ import (
 
 func main() {
   for i := 0; i < 255; i++ {
-    fmt.Printf("%d :\n", i)
+    fmt.Printf("%d (%2.2x):\n", i, i)
     for _, word := range emoji.Map(byte(i)) {
       fmt.Printf("  - %s\n", emoji.CodepointToUnicode(word))
     }

emoji/README.md

@@ -50,7 +50,7 @@ The purpose of this practice is provide simplified way to convey [checksums](htt
 
 ### Intended Audience
 
-This is intended for use by implementors of software to convey checksums or validate conveyed checksums.
+This is intended for use by implementors of software to convey checksums or validate conveyed checksums or unique fingerprints.
 
 
 ## Details
@@ -60,6 +60,17 @@ Most checksums convey in a hexadecimal notation, there showing a par of case-ins
 Having a mapping of 256 emojis this thereby reduces the number of characters (or emojis) needed to convey the checksum.
 In example, a [SHA1](https://en.wikipedia.org/wiki/SHA-1) checksum is 40 hexadecimal characters long, whereas an SHA1-emojisum is only 20 emojis.
 
+### The emojimap
+
+In the common document [`emojimap.json`](./emojimap.json) there is an ordered list of arrays.
+Each array contains a set of strings that are either a human readable word or the human readable unicode point.
+For example, byte `0xe8` (position 232) is `[":nauseated_face:", "U+1F922"]`.
+
+For more complex and visually similar emoji there are times that the unicode is a combination.
+This is the case for flags and people.
+For example, byte `0xd9` (position 217) includes `:surfer:`, `U+1F3C4`, and `U+1F3C4U+200DU+2642U+FEOF`.
+When there is a combination, implementations MUST split on the "`U+`".
+
 ## References
 
 * Unicode Technical Report #51 - http://www.unicode.org/reports/tr51/

emoji/emojimap.json

@@ -1,5 +1,5 @@
 {
-  "version": "draft+2",
+  "version": "draft+3",
   "description": "This ordered list of emojiwords is the conventional order for the practice of conveying checksums with emoji. Each position provides the alternative for resolving the desired emoji.",
   "emojiwords": [
     [":+1:", "U+1F44D"],

emoji/list.md

@@ -12,7 +12,7 @@ This ordered list of emojiwords is the conventional order for the practice of co
 
 ### Version
 
-draft+2
+draft+3
 
 ### List
   * `0` -- :+1: `:+1:` [U+1F44D](http://www.unicode.org/emoji/charts/full-emoji-list.html#1F44D)

emoji/map_gen.go

@@ -6,7 +6,7 @@ package emoji
 func init() {
   mapGen = VersionedMap{
 	  Description: "This ordered list of emojiwords is the conventional order for the practice of conveying checksums with emoji. Each position provides the alternative for resolving the desired emoji.",
-	  Version: "draft+2",
+	  Version: "draft+3",
 	  EmojiWords: []Words{
       Words{ ":+1:","U+1F44D",
       },