Removed 500px logo

Have removed 500px logo as photo hosting is now with Flickr.com.
Amended config file
Removed depreciated options.
Corrected sitemap plugin

Sitemap plugin did not have the live url value.
Removed '@' symbol

The '@' symbol was breaking the Jeyll build on GitHub.com.
Add drafts folder to gitignore file.
Change code layout
Add --no-cache flag on watch.sh
Add TOC Feature
Merge of table_of_contents