Fix basic-application + jgtiflow configuration

[lalmeras]

With Igloo 4.0.0, we step into a jgtiflow issue. In basic-application-{core-webapp}/pom.xml, we use ${igloo.version} for igloo dependencies. It allow us to manage igloo and basic-application together, and when we create a new project from basic-application, we just add a <igloo.version>...</igloo.version> property in project's root pom to target the right Igloo version.

When jgitflow encounter an internal dependency (like igloo-component-spring), it detects that it is handled by a property. If there is no properties node in current pom.xml, it then ignores this artifact silently (this is the previous behavior, when we have no property definition in both core/webapp). But if there is any properties node, jgitflow throws an error if the version property is not in this node.

For 4.0.0, we rework basic-application-{core,webapp}/pom.xml so that it does not contain properties node.

We must find a way to use correctly properties node in basic-application project.

It is not an issue for a igloo-based project as jgtiflow ignore non-internal dependencies.

Problem in jgtitflow is here : https://bitbucket.org/atlassian/jgit-flow/src/6a57ef1ec9c490b4633d46640df637df16774a62/jgitflow-maven-plugin/src/main/java/com/atlassian/maven/plugins/jgitflow/rewrite/ArtifactReleaseVersionChange.java#lines-232 ; if properties is null, there is no exception. If properties is not null, then version property must be resolvable else it throws an error.