added hello.rb and solved test 00_hello
added temperature.rb and solved test 01_temperature
added calculator.rb and solved test 02_calculator
added simon_says.rb and solved test 03_simon_says
added pig_latin.rb and solved 04_pig_latin test
added silly_blocks.rb and solved 05_silly_blocks tests
added friend.rb and solved 06_hello_friend test
added book.rb and solved first two steps
added timer.rb and solved 08_book_titles
added array_extensions.rb and solved the tests
added temperature.rb and solved up to via factory note
solved titles issue in book.rb