Issue 619: Details of users who have ++ed a distribution. 

Ok, so the changes have been made as follows:

1. Added plusser logic to /lib/MetaCPAN/Web/Controller/Release.pm and Pod.pm
2. Displayed the plussers in /root/release.html, pod.html and ~/inc/breadcrumbs.html.
3. Added MetaCPAN::API, ElasticSearch::Transport and ElasticSearch::Transport::Curl to cpanfile
4. Added the Util.pm file to lib/MetaCPAN.

Please let me know the changes that I need to make. 
Also, let me know how should I work on improving the display of the plussers.