[Issue 7] Adds Group to questions for radio buttons
[Issue 7] Adds model changes for radio groups

Question now validates group if kind == radio
response now strips out value correctly for radio
[Issue 7] Adds group onto name for radio questions

Since creation of name is generic it was selecting all of the radio buttons in the same group this has been fixed by adding the group onto the name. which is later removed upon saving
Merge branch 'master' into Issue_7
Fix a simple spacing issue.
Merge pull request #16 from jnf/Issue_7

Fixes #7