PA Slugs include designation as well

This is because some PAs have the same name, varying only by
designation, which causes obvious issues for our slug URLs :)

Also moves the slug generation to a model method. I think it's better
placed here, and allows us access to all available PA attributes rather
than futzing around in the DataStandard class and sharing data.
Merge pull request #54 from unepwcmc/slug-with-designation

PA Slugs include designation as well
Documentation for rails caching
Merge pull request #55 from unepwcmc/caching-docs

Documentation for rails caching
cartocss on the fly for protected area page
addWdpaTiles only if data-wdpa-id?
camelcase convention for variable name
better formatting for cartocss
Merge pull request #58 from unepwcmc/cartodb

Cartodb
Support for handling legacy PP protected area URLs

The Protected Areas URLs in the previous version were in the format
`/sites/<slug>`. This commit introduces the same route, and a table that
matches the old legacy slugs with WDPA IDs.
Documentation for legacy PP handling
Add missing structure dump
Legacy PA urls match all PA sub-pages

Such as species
Merge pull request #60 from unepwcmc/legacy-urls

Legacy URLs
Merge branch 'master' into handle-search-misspellings

Conflicts:
	db/structure.sql