bwa 0.7.11

Closes #1520.

Signed-off-by: Shaun Jackman <sjackman@gmail.com>
bwa: update 0.7.11 bottle.
nxtrim 0.3.0: New formula

Software to remove Nextera Mate Pair adapters and categorise reads
according to the orientation implied by the adapter location.
nxtrim: add 0.3.0 bottle.