icons: optipng the crystal icons.

Change-Id: I194ce3ddbb041cd01ee1b9c66fec7b5e782e1a1a
icons: optipng the galaxy icons.

Change-Id: I6499e5adba9886bb14a9e6b9404e77288a4ce048
icons: optipng the human icons.

Change-Id: I868087fef544cd53fb26fc34f7ba224400468b63
icons: optipng the industrial icons.

Change-Id: Ia14988ac58c080598cad7367e0fa151de3f475ec
icons: optipng the oxygen icons.

Change-Id: I61d9b29334ec08d5f4fcb36d906212e5140cb5ee
icons: optipng the sifr icons.

Change-Id: Id4ec669fb5a58be2853d66ae80d73eae200fe657
icons: optipng the tango icons.

Change-Id: I0b526973b51eafce6b27f62b6a06057dbbc625d7
icons: optipng the tango_testing icons.

Change-Id: I4818f7761bbad9cb07800be0154e61fa1bda6090