ENHANCEMENT Allowing multiple fragments to be returned by PjaxResponseNegotiator through JSON
UNFINISHED Processing multiple PJAX responses on CMS JavaScript, introducing data-pjax-fragment attribute to identify reloadable template parts
MINOR Retaining case in PjaxResponseNegotiator, in order to pass back to client correctly
API CHANGE Moved submitForm() from $('.cms-content') to $('.cms-container'), unifying ajax response handling between panel loading and form submission
MINOR Removed ability in PjaxResponseNegotiator to send non-JSON responses for single fragments, as we're now relying on the server communicating which segment needs replacement (through the JSON key)
ENHANCEMENT Declare a single DOM element with multiple Pjax fragments. Unified ajax response handling in CMS, followup  from submitForm() refactoring. Removed replacement of arbitrary CSS selectors through Pjax, relies on a fragment now (to keep logic consistent).
MINOR Apply loading indicators to all forms, not just .cms-edit-form (which means it includes the "pages list view"). Move to correct place in LeftAndMain.js (not specific to '.cms-content')
MINOR Fixed tab selection state
MINOR Debug messages for tracking down JS layout sequence issues (disabled by default)
MINOR Improved testing docs
RECOMMIT This is a recommit of a previously merged, but reverted, commit. The initial commit had problems when running "tests/all flush=all" when dev/build would re-analyse a bunch of stuff; fixes to address this went into https://github.com/silverstripe/sapphire/pull/487, but for some reason the actual base changes didn't, so I'm re-submitting them in a separate pull.

BUGFIX Versioned's constructor doesn't provide suitable defaults. Previously a bug/feature in singleton, where it would pass null,true as params to strong_create, which would then get passed through as params to Versioned's constructor, meant that the code still executed fine (as was set to something that wasn't an array, so the null and true were instead taken as args). The fact that the usage of singleton(Versioned) never really used the classes code, purely for value lookup, meant that this never propagated errors. I've now switched singleton() to use the injector for retrieving values, which means these dud values are no longer passed through

CHANGE Given that Config::inst is an implementation of the singleton pattern itself, I've removed the extra call to singleton(). A side effect of this is that it gets around a possibly nasty circular reference with the dependency injector (which relies on the config object); in future, this dependency structure should really be structured from the DI directly.

MINOR Change singleton and strong_create to use dependency injector
BUGFIX Updating tree state (after adding/renaming nodes, changing parent). Deselecting nodes when switching to edit view (fixes #7389, #7336, #7309)
MINOR Returning at least some error feedback when admin/* route isn't found (fixes #7409)
MINOR Updating compass sprites with its changed ordering starting with 0.12 release (see http://compass-style.org/blog/2012/02/01/compass-0-12-is-released/)
MINOR Make tree loading indicator visible on page icon to ensure it shows when drag handles are hidden (in "sidebar view") (fixes #7256)
API CHANGE Moved RestfulServer into its own module at https://github.com/silverstripe/silverstripe-restfulserver (fixes #7282)
API CHANGE Moved SapphireSoapServer and SOAPModelAccess into its own module at https://github.com/silverstripe/silverstripe-soapserver (fixes #7282)
MINOR Fixed node deselection when changing areas (e.g. "pages" to "edit page")
BUGFIX Fail silently in _t() legacy mode when using sprintf(), to avoid outdated translations breaking with a fatal error (e.g. CMSMain.ACCESS changed from two to one usage of {title}, which isn't changed yet in most languages). Slight performance overhead, but acceptable since its legacy usage only
BUGFIX Moved localised JS messages in correct module (fixes #7393)