BS-2823, move almost all implementation classes in bonita-common-api-impl
BS-2823, do not include unnecessary impl classes
BS-2825, move classes to bonita-common-api-impl
remove unused javadoc
Add summary to org.bonitasoft.engine.api
Add overview to common-api module javadoc.
BS-2827, Common API Javadocs
Integrated javadoc stylesheet
Complete documentation of API interfaces
BS-2827, Common API + model Javadocs
BS-2675, add javadoc on command related classes
build javadoc only in profile "javadoc"