Sass+ rollup improvements

Some improvements to task files.

• Change the order of plugins so node-resolve is first
  • 3c5cf3db9bab003b61978ccd4acc4f2cccfaf28b
• Change Sass task to handle unlinking and add autoprefixing
  • d63f9c932cc13cd9ecfc79a5f875bdcd58b88469

PR

• #12