prep gemspec to support c extensions
add the crypto extension
modify Rakefile to conditionally build the ext
add spec for SimplePassword class
add SimplePassword class
require simplepassword
ignore bundle files
add specs for #salted_sha512, #salted_sha1, and #apropos
define methods for #salted_sha512, #salted_sha1, and #apropos
remove version string
bump version
update readme to include SimplePassword example
add inline documentation
more inline docs
more inline documentation
replace case statement with if/else