Earth Reader for Web 0.2.0

• earthreader crawl command adds new options:
  • -f/--feed-id crawls only the specified feed if present.
  • -v/--verbose shows more detail information.
• Categories are folded at first.
• Keyboard shortcut for toggle folding category.
• Expand categories when click feed for mobile layout.
• Google reader style shortcuts.
• Mark all as read function #28
• Fix a bug that "crawl now" button didn't work.
• Relative directory path on command line.
  #36
• GUI launcher for OS X. #38