[Fix #39]Fix configuration load

Load the configuration file before starting the download of the
application.

Configurations are stored in window and then are copied in AngularJS
constants.

Change the default root path of API and of the web application.
Display creation date in papers page

Diplay creattion date in paper list.

Papers can be filter by creation date (created today, yesterday, this
week, last week, this month and this year).