make fs-ext optional

lib/local-fs.js

@@ -1,10 +1,19 @@
 var fs = require('fs')
-  , fsExt = require('fs-ext')
   , Path = require('path')
   , mkdirp = require('mkdirp')
   , mystreams = require('./streams')
   , FSError = require('./error').FSError
 
+try {
+	var fsExt = require('fs-ext')
+} catch(e) {
+	fsExt = {
+		flock: function() {
+			arguments[arguments.length-1]()
+		}
+	}
+}
+
 function write(dest, data, cb) {
 	var safe_write = function(cb) {
 		var tmpname = dest + '.tmp' + String(Math.random()).substr(2)

package.yaml

@@ -27,9 +27,11 @@ dependencies:
   semver: '>= 2.2.1'
   minimatch: '>= 0.2.14'
   bunyan: '>= 0.22.1'
-  fs-ext: '>= 0.3.2'
   mkdirp: '>= 0.3.5'
 
+optionalDependencies:
+  fs-ext: '>= 0.3.2'
+
 devDependencies:
   rimraf: '>= 2.2.5'
   mocha: '>= 1.17.0'