bioruby/bioruby — pull request #71 by georgeG (2012-10-05 07:11:51+00:00)
Title: add a precision to the gc_percent method

It would be nice if the gc_percent method would return a percentage with a user defined precision
```ruby
s = Bio::Sequence::NA.new('atggcgtga')
puts s.gc_percent #=> 56
puts s.gc_percent(2) #=> 55.56
```