Copy changes to the child benefit form fields
Fix whitespace
Copy changes to the results text when tax is due
Wrap content in an <article> tag

This makes the callout box styling work properly
Fix feature spec copy assertions
Add link to tax charge guide in conditional copy
Show alternative message when no children after 7th Jan 2013
Extract 7 Jan 2013 into a new contstant TAX_COMMENCEMENT_DATE
Merge remote-tracking branch 'origin/moar-copy-changes'

Conflicts:
	app/models/child_benefit_tax_calculator.rb