Remove unused pages and controllers

The style guide is no longer used, and neither is the documents controller.  This commit removes those files and updates the routes file.
Data segregation: Only display listing pages if supplier ID matches

If a supplier with a valid SSP login cookie tries to hack the URL to view another supplier's product details/summary page they should not be able to see them.
Data segregation: Only save listing pages if supplier ID matches

If a supplier with a valid SSP login cookie tries to spoof a POST request to overwrite another supplier's product details they should not be able to.
Fix string display bug

For some text field questions, values containing quotes were being cut off when re-displayed in pages. There were two issues here: for textboxes the use of single quotes in the template meant that values with single quotes broke the template.  This is fixed by using double quotes in the templates.  For the dynamic textbox-input-list-item s there was a further problem with values being 'triple mustached' - i.e. not HTML-escaped.  Changing the script to use 'double mustacheing' instead fixes this.
Return user to summary page after clicking 'edit'

When you edit a page, saving your changes should return you to
the summary page.

The default flow is still to complete one page after another.

This commit add a URL parameter (`return_to_summary`). On the
'edit' links on the summary page it is set to `yes`.

When you view a page which has `?return_to_summary=yes` after the
URL the button will say 'Save and return to summary' rather than
'Save and continue'. Clicking the button will do what the button
says it does.
Display saved values on page 16

Previously saved values were not repopulating on page 16. This fixes the issue.
Merge pull request #130 from alphagov/page_16_data_save

Display saved values on page 16
Remove legacy Boolean from method params
Removed debug gubbins
Merge pull request #129 from alphagov/save-and-return-to-summary

Return user to summary page after clicking 'edit' and saving
Added new AuthenticatingQuestionPage class which extends Authenticating controller and should be used for Question Pages
Listing class now contains a method to retreive a completed page by page_id
Removed debugging gubbins
QuestionPageDisplay now retrieves Page using the new getByPageId method in Listing, uses to load previously entered questions
Merge pull request #128 from alphagov/fix_string_display_again

Re-fix string display bug
Refactored all QuestionPages to extend new AuthenticatingQuestionPage class and use inherited methods for saving questions to pages
Remove old imports from Service.java
Removed logging stuff and email now loads from getEmail() method
Merge pull request #126 from alphagov/page_values_not_retaining_after_upload

Page values not retaining after upload
Merge remote-tracking branch 'origin/master' into ensure-data-segregation

Conflicts:
	app/controllers/Page1.java
	app/controllers/Page10.java
	app/controllers/Page11.java
	app/controllers/Page12.java
	app/controllers/Page13.java
	app/controllers/Page14.java
	app/controllers/Page15.java
	app/controllers/Page16.java
	app/controllers/Page17.java
	app/controllers/Page18.java
	app/controllers/Page19.java
	app/controllers/Page2.java
	app/controllers/Page20.java
	app/controllers/Page21.java
	app/controllers/Page22.java
	app/controllers/Page23.java
	app/controllers/Page24.java
	app/controllers/Page25.java
	app/controllers/Page26.java
	app/controllers/Page27.java
	app/controllers/Page28.java
	app/controllers/Page29.java
	app/controllers/Page3.java
	app/controllers/Page30.java
	app/controllers/Page31.java
	app/controllers/Page32.java
	app/controllers/Page33.java
	app/controllers/Page34.java
	app/controllers/Page35.java
	app/controllers/Page36.java
	app/controllers/Page37.java
	app/controllers/Page38.java
	app/controllers/Page39.java
	app/controllers/Page4.java
	app/controllers/Page40.java
	app/controllers/Page5.java
	app/controllers/Page6.java
	app/controllers/Page7.java
	app/controllers/Page8.java
	app/controllers/Page9.java