Updated list.hbs which just works

changed the way the tags are shown, now tags will be shown as tag1, tag2, tag3
Previously there were no comma between tag. Also in the new ghost release excerpt words=10 will count 10 characters instead of 10 words.
Updated list.hbs to fix keyword tags

Changed the way the tags are shown, now tags will be shown as tag1, tag2, tag3 
Previously there were no comma between tags, they were shown as tag1 tag2 tag3 which looked weird.

Working Demo : http://www.subho.me
Update list.hbs
Merge pull request #49 from subho007/master

Add commas to tags and fix excerpt wordcount