Make path references OS independent

Change-Id: I5573995adfd52fd54bddc62d1d1ea78fb1328130
(cherry picked from commit b0f9a02394)

Conflicts:

	command.py

project.py

@@ -236,8 +236,8 @@ class Project(object):
     self.manifest = manifest
     self.name = name
     self.remote = remote
-    self.gitdir = gitdir
-    self.worktree = worktree
+    self.gitdir = gitdir.replace('\\', '/')
+    self.worktree = worktree.replace('\\', '/')
     self.relpath = relpath
     self.revisionExpr = revisionExpr