Contents cache demo

Issue: 969

alpha.4 resolving to alpha2 with yarn

Really not sure why this is happening but when I run yarn with nuxt package.json set to alpha.4 it resolves to alpha2.

nuxt@^1.0.0-alpha.4:
  version "1.0.0-alpha2"
  resolved "https://registry.yarnpkg.com/nuxt/-/nuxt-1.0.0-alpha2.tgz#03366dd8384406b26b1eeff06f7f2b12a6f40c00"

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