title: WebView fails to open local html file with whitespaces in name
body: <p>WebView is unable to show local .htm file because of whitespaces in it's name. I'm getting error </p>
  
  <pre><code>Error Domain=NSURLErrorDomain Code=-1100 "The requested URL was not found on this   server." UserInfo=0x400ea1900 {NSUnderlyingError=0x400265c80 "The requested URL was not found on this server.", NSErrorFailingURLStringKey=file:///Users/olgadalton/Library/Caches/ee.64.xxx/_books/Deployment-guide-for-Microsoft-SharePoint-Server-2010_2/OEBPS/Text/Deployment%2520Guide%2520for%2520Microsoft%2520SharePoint%2520Server%25202010_split_000.htm, NSErrorFailingURLKey=file:///Users/olgadalton/Library/Caches/ee.64.xxx/_books/Deployment-guide-for-Microsoft-SharePoint-Server-2010_2/OEBPS/Text/Deployment%2520Guide%2520for%2520Microsoft%2520SharePoint%2520Server%25202010_split_000.htm, NSLocalizedDescription=The requested URL was not found on this server.}
  </code></pre>
  
  <p>However file is existing with finder and with terminal listing:</p>
  
  <pre><code>ls -l
  total 6024
  -rw-rw-r--@ 1 olgadalton  staff   3925 Oct 11  2011 Deployment Guide for Microsoft SharePoint Server 2010_split_000.htm
  </code></pre>
  
  <p>Permission is also ok.</p>