By Hanna Rantala PARIS (Reuters) -Stella McCartney showed a summer collection packed with cocktail dresses in new, feathery materials, further expanding the range of textures used by her label, known for an ecological bent. "This collection was about coming together, bringing together handwork, craft, bringing together different innovations," McCartney told Reuters after the show. The show kicked off with actor Helen Mirren stepping out of the front row to read the lyrics of the Beatles song "Come Together." "I thought, 'oh, what fun, that would be great'," Mirren said backstage, after the show, recalling the request from McCartney to take part. "But when I was sitting there, I started getting really nervous." Models moved quickly down the runway, parading short dresses made from piles of

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