Update repository to be an importable module

Use edb.prebuilt.json from emojibot2
Provide example usage
Update readme to reflect chanegs

Simplify code/directory structure

	new file:   .gitignore
	modified:   Emojipasta.go
	modified:   README.md
	deleted:    assets/emojis.json
	new file:   edb.prebuilt.json
	new file:   example/main.go
	deleted:    generator/generator.go

example/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/xerosic/emojipasta"
+)
+
+func main() {
+	input := "This library allows you to create emojipastas like this one"
+	output := emojipasta.Generate(strings.Split(input, " "), 3, false)
+	fmt.Println(output)
+}