Rules methods, arguments with default values moved to the back
README: changed add_rule examples to be ruby 1.8.7 compatible
README: use java_opts as variable name in all the examples to avoid confusion using ruby 1.8.7
Merge pull request #4 from onddo/ruby-1.8.7

Make compatible with ruby 1.8.7
close #5

handle numeric values less than 1 MB