Move mapping to yaml rather than java files.
Work on mapping.
On going work on mapping improvements
Mapping definition is not yaml based and generated rather than java defined.
Merge commit 'f649eecf1288ddd493938b9711c82ecb05358bdc' into wd03-improvement

Conflicts:
	alien4cloud-core/src/main/java/alien4cloud/tosca/parser/impl/advanced/InterfaceParser.java
	alien4cloud-core/src/main/java/alien4cloud/tosca/parser/impl/advanced/InterfacesParser.java
	alien4cloud-core/src/main/java/alien4cloud/tosca/parser/mapping/Wd03RelationshipType.java
	alien4cloud-core/src/main/java/alien4cloud/tosca/parser/mapping/Wd03RequirementDefinition.java
 - Fix mapping generation
Remove post start as TOSCA agreed to remove it.
Fix relationship mapping.
Merge branch 'wd03-improvement' into develop