File.read is better than "open".

File.read is faster than open.

```
require 'benchmark'

Benchmark.bm do |x|
  x.report { 1000.times do ; open("foo.txt").read; end }
  x.report { 1000.times do ; File.read("foo.txt"); end }
end
       user     system      total        real
   0.030000   0.000000   0.030000 (  0.034196)
   0.020000   0.010000   0.030000 (  0.024281)
```