Initial setup for tdd_multiplication_table

* create answers subdirectory and copy rb files into it
* add .rvmrc
* add Gemfile w/ 'guard-rspec' and 'rb-fsevent'
* create subdirectory lib and move multiplication_table into it
* create subdirectory spec and move multiplication_table_spec into it
Merge pull request #1 from BethM/tdd_multiplication_setup

Initial setup for tdd_multiplication_table