converted *.rb files from dos to unix eol characters
converted *.js files from dos to unix eol characters
converted *.html.haml files from dos to unix eol characters
fixed css files
[#68924438] added 'download prices' feature
[#68924438] added PricesController#download
[#68924438] added PricesDownloader and started the spec
[#68924438] added logic to PriceDownloader to get pricess from an agent and save them
[#68924438] finished changes to PricesController
[#68924438] finished making 'download prices' feature pass
[#68924438] moved stock price classes to lib
[#68924438] added unit test for memory download agent
[#68924438] started adding spec for quandl download agent