Make link more specific

Make link to api.rubyonrails.org more specific to the associations page : http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html
Add my solution and a great additional resource
change Ingi Kim's solution url
Add Mark Westfall's Student Solution
Added student solution to project_html_css page
Merge pull request #169 from codyarsenault/patch-1

Added student solution to project_html_css page
adding the code for brianllamar

I added the link to my code, but also removed the bartliolio link that no longer worked.
Merge pull request #170 from brianllamar/master

adding the code for brianllamar
Merge pull request #168 from mwestfall88/master

Add Mark Westfall's Student Solution
Merge pull request #167 from ingikim/patch-3

change Ingi Kim's solution url
Merge pull request #166 from mousterian/master

pls add advanced blocks solution
Merge pull request #165 from afshinator/patch-11

Add my solution and a great additional resource
pull solutions and fixes
fix broken link
added basic associations project