Add Travis CI.

Big-O will support MRI but can't support jRuby because it can't use forks,
and neither Rubinius which doesn't have the same kind of support for space
usage (probably a problem with forks again?).

.travis.yml

@@ -0,0 +1,5 @@
+language: ruby
+rvm:
+  - 1.9.3
+  - 1.9.2
+  - 1.8.7

lib/big-o.rb

@@ -1,5 +1,6 @@
 require 'timeout'
 require 'benchmark'
+require 'bigdecimal'
 
 require 'big-o/complexity_base'
 require 'big-o/time_complexity'

lib/big-o/space_complexity.rb

@@ -65,7 +65,7 @@ def memory_measure(pid)
 
     # @see ComplexityBase#values_to_s
     def values_to_s
-      @result_set.values.to_s
+      @result_set.values.inspect
     end
   end
 end

lib/big-o/time_complexity.rb

@@ -1,5 +1,3 @@
-require 'bigdecimal'
-
 module BigO
   # Measure time complexity.
   class TimeComplexity
@@ -53,7 +51,7 @@ def increase_scale
 
     # @see ComplexityBase#values_to_s
     def values_to_s
-      @result_set.values.map(&:to_f).to_s
+      @result_set.values.map(&:to_f).inspect
     end
   end
 end