Add go between for style_scrapper

Doing this so I can add another class that will cache previous results. the StyleGenerator will use the scrapper and this other class to check if github styles are new, and then cache the results locally
Add StyleSheet with tests

StyleSheet is meant to rep an actual css file. It holds a file name, contents, and url location. Also has ability to load css content from the remote url
Add rspec as dev dependency
Force template to use new StyleSheet objects
Fix regex to parse styletag

Previous was missing the potential to have a '-' in the name
Add pry to development
Add real github address to spec

Previously wasn't catching the possible dashes in a name
Now returns an array of StyleSheet objects
Add a caching layer to stylesheets

Will allow for full / styled markdown when no internet connection is available
Add cached stylesheet listings
Fix issue to ensure always using cached when we can
Add note about new caching of styles
Using local file path as url

This allows for loading of styles from cache, and not needing the network so long as a cached style is available
Forces reload from file system for css styles
Minor cleanup
Vesion bump