remove code test/usage inside itself class file.
adding little tests for "Speak\Number".
keep variable names in a unique language.
adding composer.json with PHPUnit as dependency.
adding tests for Number class.
refactoring source code with huge improvements.
namespacing NumberTest.
making the life easier when testing/checking standards.
updating README.md; changing usage sample and fixing some typos.
Merge pull request #3 from andreyknupp/master

Some improvements were made.