Remove lodash dependency

lib/utils/git.js

@@ -1,4 +1,4 @@
-var _ = require('lodash');
+var is = require('is');
 var path = require('path');
 var crc = require('crc');
 var URI = require('urijs');
@@ -69,7 +69,7 @@ Git.prototype.resolve = function(giturl) {
         if (this.resolveRoot(giturl)) return Promise(giturl);
         return Promise(null);
     }
-    if (_.isString(giturl)) giturl = Git.parseUrl(giturl);
+    if (is.string(giturl)) giturl = Git.parseUrl(giturl);
     if (!giturl) return Promise(null);
 
     // Clone or get from cache
@@ -88,8 +88,10 @@ Git.prototype.resolveRoot = function(filepath) {
 
     // Extract first directory (is the repo id)
     relativeToGit = path.relative(this.tmpDir, filepath);
-    repoId = _.first(relativeToGit.split(path.sep));
-    if (!repoId) return;
+    repoId = relativeToGit.split(path.sep)[0];
+    if (!repoId) {
+        return;
+    }
 
     // Return an absolute file
     return path.resolve(this.tmpDir, repoId);
@@ -114,10 +116,12 @@ Git.parseUrl = function(giturl) {
     // Extract file inside the repo (after the .git)
     fileParts = uri.path().split('.git');
     filepath = fileParts.length > 1? fileParts.slice(1).join('.git') : '';
-    if (filepath[0] == '/') filepath = filepath.slice(1);
+    if (filepath[0] == '/') {
+        filepath = filepath.slice(1);
+    }
 
     // Recreate pathname without the real filename
-    uri.path(_.first(fileParts)+'.git');
+    uri.path(fileParts[0] + '.git');
 
     return {
         host: uri.toString(),