[TECH_SUPPORT] LPS-29690 SDK 6.1.20: Unable to deploy new CSS modifications

Hi Ray,

I send you this pull request after Nate's suggestion, could you take a look at it?

Original pull request to Nate:
natecavanaugh#985

My comments:
http://issues.liferay.com/browse/LPS-29690?focusedCommentId=258197&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-258197

This is important because several of our customers and a lot of community people are worried about this since we are currently forcing to parse all css sass files every time we want to deploy our theme taking into account that this process takes an average of 10 seconds for each file.

Thanks.