Added documentation: Action principles.
Rephrased installing instructions.
Merge branch 'release/0.0.1-alpha'
BaseStores should have their own references and elements objects.
Merge branch 'hotfix/element-inheritance-fix'
Action operations were ignored when including an active.
Merge branch 'hotfix/ignored-on-active-fix'
Added API documentation.
Merge branch 'master' into develop