optimized XSL
#60 reproduced
#60 fixed
#61 explained why not
#52 example SRS of facebook added
#57 reproduced
#57 fixed
#43 fixed
#72 fixed
#67 fixed
#75 implemented
#69 reproduced
#69 fixed
#65 fixed
#77 fixed
#78 reproduced
#78 fixed
#79 fixed
#68 reproduced
#68 fixed