Upgrading persistence.xml to version 2.1, using default datasource, standard JPA property.
Use Java EE 7 API and show jsonp parsing from github via batch job.

Features added:
  * Show github avatar based on 'name' field search.
  * github avatar urls are fetched in a batch background job which gets kicked of on each submit.

Changes done:
  * Use 1.7 in compiler-level to support use of Java 7 syntax since Java EE 7 requires Java 7 this should be fine.
  * Add dependency on javax.javaee.api 7.0 to get batch and json api available during compilation.
  * Add GithubBatchlet + .xml to setup the simplest batch job possible.
  * Use jsonp api to fetch via github api
  * Throttle the fetching waiting 60 seconds to avoid getting 403's from github anonymous usage
  * Add methods to MemberRepository to store avatarurl in @Applicationscope
  * Add column on index.html for avatar <img>
  * Add a few columns in dataset to have existing github usernames
Use IDENTITY as generated value strategy as otherwise you cannot seed your data with more than one element. Without this change a unique constraint will happen until you have submitted enough to get the internal counter pass the number of existing entries.