Merge branch 'release/2.3.0' into develop
[DSI Releaser] prepare for next development iteration
[dml-compiler] Add Project.getDomainModel

  * Closes #177
Add Travis Config
[ff-maven-plugin] Add DmlZipCreatorMojo to the ff-maven-plugin
[dml-maven-plugin] Bug Fix: Dependency artifacts may not always be available

  * Closes #178
Fix issue #176 - properly handle multiplicity ranges for Default Code Generator
Merge pull request #180 from britalmeida/develop

Fix issue #176 - properly handle multiplicity ranges for Default Code Generator
New Feature: Add Public API to check if a Fenix Framework instance is a new one

  * Also cleaned up JVSTM/OJB's data repository structure updater
Merge pull request #183 from jcarvalho/feature/new-instance-check

Add API to check if a Fenix Framework instance is new
[jvstm-ojb] Restart the transaction on jvstm.CommitException

  * Closes #179
[dml] Improving DomainObjectAllocator error logging
[dml] Added the concept of version to Project
[core-api] New Feature: Store information about the installed modules

  * Upon initialization, information about the installed modules is kept
    in an instance of InstallationData
  * In the future, this information will be usable to perform automatic
    store upgrades
[core-api] Make ModuleData and ModuleInstallation Serializable

  * Some backends are still breaking the contract and require ValueType
    classes to be Serializable
New Feature: Added public API to verify if a DomainObject is valid
[jvstm-ojb] When deleting an object, put a "Deleted" mark on its VBoxes
[dml-compiler] New Feature: Support modifiers in classes, slots and relation roles

  * For now, only the "public" and "protected" modifiers are supported
[dml-compiler] Allow modifiers to control the visibility of generated methods and classes

  * For now, only the visibility of classes, slots and roles is affected
  * The default behaviour (if no modifier is specified) is public.
  * If the "protected" modifier is specified, the generated method will be protected
Merge pull request #185 from jcarvalho/feature/slot-visibility

Allow control of slot/role visibility