Added EavAttribute::getPossibleValues(), EavAttribute::setPossibleValues()

Signed-off-by: iAchilles <igor.manturov.jr@gmail.com>
Updated php-doc

Signed-off-by: iAchilles <igor.manturov.jr@gmail.com>
Updated unit tests
Added support for validators that validate multivalued attributes
Added validator classes CountValidator, MultivaluedValidator
Added GUI module to manage EAV attributes and attribute sets
Updated readme.md
Added localized lines
Merge branch '1.0.2-branch' of github.com:iAchilles/eavactiverecord into 1.0.2-branch
1.0.2 release
Merge pull request #6 from iAchilles/1.0.2-branch

1.0.2 release