make internal/external naming consistent

lib/b64.js

@@ -1,5 +1,8 @@
 'use strict'
 
+exports.toByteArray = toByteArray
+exports.fromByteArray = fromByteArray
+
 var i
 var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
 var lookup = []
@@ -23,7 +26,7 @@ function decode (elt) {
   return v !== undefined ? v : -1
 }
 
-function b64ToByteArray (b64) {
+function toByteArray (b64) {
   var i, j, l, tmp, placeHolders, arr
 
   if (b64.length % 4 > 0) {
@@ -87,7 +90,7 @@ function encodeChunk (uint8, start, end) {
   return output.join('')
 }
 
-function uint8ToBase64 (uint8) {
+function fromByteArray (uint8) {
   var i
   var extraBytes = uint8.length % 3 // if we have 1 byte left, pad 2 bytes
   var output = ''
@@ -124,6 +127,3 @@ function uint8ToBase64 (uint8) {
 
   return parts.join('')
 }
-
-exports.toByteArray = b64ToByteArray
-exports.fromByteArray = uint8ToBase64