* Revise the 'pages' module to export two methods: 'loadPages' and 'loadPageMap'
Update all existing references to use 'loadPages' for now
* Remove explicit Promise resolutions on loadPage* methods
* Condense reduction method into its now-singular usage spot
* Opt for for-of instead of forEach
* Make require of pages in warm-server more explicit
* Be more explicit about find-page using a pageMap
* Be more explicit about find-page-in-version using a pageMap
* Be more explicit about site-tree using a pageMap
* Extract the map creation from loadPageMap
* Be more explicit about using a pageMap
* Update redirects precompile to take two arguments: pageList, pageMap
* Rename internal loadPages method to loadPageList
* Clarify pageMap is what is stored in context.pages
* Use loadPageMap in tests and stuff
* add frontend search support for GHAE version
* add support for GHAE version to Algolia sync
* add browser tests for frontend search
* if a version can be derived from a path, but it is not a real version (like from a path that 404s), fall back to dotcom
* Update javascripts/search.js
* Update lib/algolia/sync.js
