properly parse docblock annotations

The old regex would allow docblocks like:
    /**
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\ManyToMany(targetEntity="PriceList", inversedBy="areas", fetch="EXTRA_LAZY")
     * @ORM\JoinTable(name="area_has_pricelist",
     *      joinColumns={@ORM\JoinColumn(name="area_id", referencedColumnName="id")},
     *      inverseJoinColumns={@ORM\JoinColumn(name="pricelist_id", referencedColumnName="id")}
     * )
     */

But that would crash later on when trying to create a dom node with the generic
docblock element because the name gets parsed into Orm\JoinColumn(...
and the generic docblock elementry tries to create an dom element with that
name as a tag.
Merge pull request #155 from exi/docblock-parser-fix

properly parse docblock annotations