Igore MacOS resource files and RVM related ones.
Use the latest rspec and jeweler gems. Use simplecov instead of rcov.
Added simplecov settings
Added addtional tests and adjusted existing ones to test out new/modified functionality.
Modified to_katakana to handle hiragana conversion as well as romaji. Modified kana2kana - it now converts hiragana to katakana and vice versa on a per character basis. Added is_hiragana? and is_katakana? methods. Modified is_kana? - uses is_hiragana? and is_katakana?. Modified is_kanji? - checks for alpha numerics characters as well.