PLAT-150 Exporting page

[pvhee]

Fixes https://jira.comicrelief.com/browse/PLAT-150

Changes proposes in this PR

• Refactored page export snippets inside new cr_page module
• @gusliedke Add a sample page node in json format

[pvhee]

@gusliedke confirming the error and figured out why this happens: when enabling modules (cr_default_content, which holds this exported page), the config/install snippets from the profile are not yet installed, so enabling cr_default_content fails. This is very annoying behavior and I see 2 ways of fixing this:

• enable cr_default_content after installing the site (as part of the phing build, and separately on travis)
• factor out all the exported page content type .yml files and put in cr_page rather than as part of the profile.

@bimsonz what do you think?

[pvhee]

@gusliedke this seems to work - could you put in a proper content export instead? you can edit the same page node I put as part of be41cf9

[AndyEPhipps]

Some boring footer-style pages added

[pvhee]

@AndyEPhipps sweet, merging in