Should allow to have only code related to display in XWiki page and all preprocessing done in the web app.

- Use slf4j and logback for logging
- Copy dependencies on `package` Maven phase instead of `install`

To document deployment.

Only include libraries with scope `compile` in the `lib` folder used as jar `Class-Path` define in `MANIFEST.MF`

Various code clean up and potential bug fix

See merge request !5

- Use annotation for servlet over configuration in `web.xml`
- Remove `throws` for servlet methods that do not throws exception
- Remove useless `serialVersionUID`
- Add `final` keyword
- Remove code useless
- Add missing javadoc
- Use `StringBuffer` append instead of concatenation
- Add FIXME comment (in `Metric.java` line 153 and in `TreeNode.java` 36) due to potential bug
- Fix `CREATE DATABASE` SQL statement syntax (`IF NOT EXISTS` need to be locate before database name) in order to match what is documented in official MySQL and MariaDB documentation
- Fix potential bug in `TreeNode` line 82

Gracefully handle db connection issue, logging and various improvements

See merge request !4

- Restore `Class.forName` to load JDBC driver: `Class.forName("org.mariadb.jdbc.Driver")`
- Add some logs for debug
- Fix reading configuration file from classloader (`WEB-INF/classes`)

- No longer get JDBC driver using `Class.forName`.
- Remove System.out and System.err and replace them with call to SLF4J for logging and logback has a backend with currently only a development debug configuration that log to STDOUT.
- Use MariaDB JDBC driver.
- Make code tolerant to database connection issue (log error in log and display error message to user).
- Get d3.js using HTTPS (avoid a redirection).
- Set default project using the first one in project list rather than hardcoded ASM.
-  Use Servlet version 3.1.0 instead of 4.0.1 as we target Jetty 9.4 that only support servlet 3.1.0.

Add a parent pom to specify dependencies and plugins versions

See merge request !3

Parent pom is used to centralized the specification of plugin versions to use (in order to get reproducible build) and also dependencies version (to use same version across all modules of the project).

Add JUnit 5 to use latest version of JUnit as project have currently no tests.

Fix Gitlab bug open time: only open bugs were counted. And set update time to min(update, close) for all bug trackers

First basic CI configuration

See merge request ow2/ow2-mrl!2

Need to be implemented with automated deployment using maybe SSH or Ansible.

Only compile and run test.