Changes in node-dir module. While traversing the file list, if there is any
error, then we should not stop, rather we should skip that file and proceed for
next files.

Change-Id: I5943fbb1154a27ea5253cd4e9a20f19dc766065c
As we do not need sans.css per Sagar, so removing it from packages.xml.
Closes-Bug: #1352742

Change-Id: I339a0ed7d949438a460c74f13981927174ebe371