Added symlink support.
New content data format:
  number of contents
  content1
  content2
  ..
  number of instances
  instance1
  instance2
  ..
  number of symlinks
  symlink1
  symlink2
  ..

Where symlink format is:
  server, symlink path, symlink target
Fixed review issues
Fixed review issues
Fixed review issues. Made rake pass.
Merge pull request #254 from bbfsdev/issue_236_symlinks

Added symlink support.