UI initial implementation.

- A user can commit and be informed about
  submissions of blueprint validation requests.
- Appropriate dockerfiles have been added for the
  UI and the required postgreSQL db.
- .gitignore file has been updated
- Integration with Jenkins completed
- The URL of the result is retrieved and
  displayed
- Multi-threading is now supported
- Notification callback from Jenkins implemented
- Results are retrieved from Nexus
- Results are displayed
- UI and postgreSQL docker projects support the
  makefile automation build and push process
- README file is included
- CHANGELOG file is included
- Coala static code analysis was performed

JIRA: VAL-14

Signed-off-by: Ioakeim Samaras <ioakeim.samaras@ericsson.com>
Change-Id: Icd2a97426bfbfc6e4eb4ec5edbda6689e2d4645f