Add crawler process to Procfile

To enable to run crawler process via Foreman

    $ foreman start         # start both web and crawler processes
    $ foreman start crawler # start crawler process
Add Run section to README
readerでレーティング周りが動かないのを修正
Merge pull request #181 from kan/fix-rate-js

readerでレーティング周りが動かないのを修正
Merge pull request #180 from fastladder/foreman_crawler

Add crawler process to Procfile
ruby2.1.3