fix web/index.html
delete index.html on web and static_context
upgrade version 4.1.1.snapshot

- update database model
   - introduce surrogate keys
   - split certificate from user table
   - improve domain model
- enable JPA 2.1 for database schema generation
- use h2 database for unit testing
- add logging business messages
- add exception codes
- upgrade spring version from 5.0.6  - 5.1.0
- upgrade spring security version from 4.2.6.  - 5.1.0
- remove org.mortbay.jetty  - jsp-2.1-glassfish