fixes #28

https://github.com/m3xm/hikari-for-Jekyll/issues/28

fix for stylesheets:
ensure that if baseurl is "mysite.com/" that the css path generated is
mysite.com/css/main.css
{{ site.baseurl| split: '/' | join:'/' }}/css/main.css

fix for link home:
ensure that link to home defaults to "/" even if baseurl is empty string
{{ site.baseurl | split:'/' | join:'/' | append:'/'  }}

reference to to liquid tags:
https://github.com/Shopify/liquid/wiki/Liquid-for-Designers#tags