fix magentoAttributeMapper
little fix on attribute mapper
handle category without root mapping
fix on configurable export
add category not mapped exception
Yoda style check to avoid null assignment
removed spec
Merge pull request #197 from akeneo/enhancement/category_export_without_parent

Enhancement/category export without parent
Merge pull request #196 from akeneo/fix/configurable_selection

fix on configurable export
Merge branch 'master' into feature/image_option_export

* master:
  removed spec
  Yoda style check to avoid null assignment
  add category not mapped exception
  fix on configurable export
  handle category without root mapping
  little fix on attribute mapper
  fix magentoAttributeMapper
Merge branch 'feature/image_option_export' of git://github.com/akeneo/MagentoConnectorBundle into feature/image_option_export

* 'feature/image_option_export' of git://github.com/akeneo/MagentoConnectorBundle:
  Update AttributeCleanerSpec.php
  fix blank lines