Framework configuration refactoring major changes

src/main/java/accounts/FrameworkUserManager.java
- minor changes of some get functions
- added a rollback of virtuoso user creation if the graph insert has an error
- added a missing prefix to  getPrefixes() (I was having an error because a default prefix : was missing)

src/main/java/authentication/FrameworkConfiguration.java
- this file changed a lot to be able to read configuration from web.xml and from ttl files

src/main/java/accounts/VirtuosoUserManager.java
- irrelevant formatting changes

src/main/java/authentication/web/AuthenticationServlet.java
src/main/java/authentication/web/GraphManagerServlet.java
src/main/java/authentication/web/HttpRequestManager.java
src/main/java/authentication/web/UserManagerServlet.java
src/main/java/authentication/web/VirtuosoProxy.java
- added a exception handle
- added the context parameter to the Framework configuration

src/main/java/authentication/web/RdfStoreProxy.java
- added the context parameter to the Framework configuration
- I started checking how to do here the exception in order that the webapp provides more information about errors.. but not finished
- do some formatting

src/main/webapp/WEB-INF/web.xml
- lots of changes.. some configuration is to be handled here : namespaces, Uris, and email settings

src/main/resources/*
- replaced all configuration files
- these files are copied to classes directory when the application is deployed, and then, they can be read by the configuration class

src/main/webapp/js/config.js

- these file should not hava anymore any configuration for the endopoints

- I have to still change it to be able to take namespaces form the server.. thus some configuration is still there