Merge pull request #50 from glogiotatidis/master

[fix bug 964677] Do not include 'target_geo' in json response if no country.
Fix bug 970894: Move snippet preview form outside of main form.

hoosteeno tracked down an issue with the snippet preview to the fact 
that it used a form within a form, which isn't allowed by the html5 spec
and apparently doesn't work in Nightly anymore. We fix it by moving the
preview form outside of the containing form.
[fix bug 984462] Add help text to JsonSnippet.icon.
Merge pull request #52 from glogiotatidis/984462

[fix bug 984462] Add help text to JsonSnippet.icon.