Valdation

added missing comma in Model
Merge pull request #39 from nilamdoc/correction

Valdation
Example code didn't work; fixed

The example code contained a couple of typos, one where the $_strings variable in the helper was private, so inaccessible by the parent _render function, and one in the template, where the wrong convention was used to access the link function.  
Merge pull request #40 from sibaz/master

Bug fixed in  handling-http-requests/helpers.wiki
renamed .wiki to .md
Merge pull request #41 from bruensicke/wiki2md

renamed .wiki to .md
Fix Readme Symlink
Merge pull request #44 from AntoineLav/master

Fix readme symlink