Restructure repository

The evaluator is the main part of this, so it doesn’t have to be in a
subdirectory.

.gitignore

@@ -1,2 +1,2 @@
-/evaluator/vendor/
-/evaluator/bangs.go
+/vendor/
+/bangs.go

scripts/includebangs.go

@@ -10,7 +10,7 @@ import (
 )
 
 func loadBangs() (bangs map[string]string) {
-	data, err := ioutil.ReadFile("../bangs.yml")
+	data, err := ioutil.ReadFile("bangs.yml")
 	if err != nil {
 		panic(fmt.Sprintf("Failed to load bangs.yml: %v", err))
 	}
@@ -40,7 +40,7 @@ func main() {
 		panic(fmt.Sprintf("Failed to create bangs.go: %v", err))
 	}
 
-	out.Write([]byte("// Code generated from ../../bangs.yml DO NOT EDIT.\n"))
+	out.Write([]byte("// Code generated from ../bangs.yml DO NOT EDIT.\n"))
 	out.Write([]byte("package main \n\nfunc getBang(name string) string {\n\tswitch name {\n"))
 
 	for _, bangName := range bangNames {