update script/gen_gallery.py for new examples
update script/gen_gallery.py for new examples

- add custom views for laplace_coupling_lcbcs.py, elastic_shifted_periodic.py

BubuLK/sfepy,lokik/sfepy,rc/sfepy,lokik/sfepy,lokik/sfepy,sfepy/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,sfepy/sfepy,vlukes/sfepy,rc/sfepy,RexFuzzle/sfepy,sfepy/sfepy,lokik/sfepy,rc/sfepy,vlukes/sfepy,BubuLK/sfepy,vlukes/sfepy,RexFuzzle/sfepy