"edit" form expansion in AssetUploadField

Form wasn't expanding because of fixed heights. Backported fix from 3.1.
Update requirements.md

Missing semicolon in example code.
Merge pull request #2383 from ryanwachtl/patch-1

Update requirements.md
BUG: Image resize allows skewing of image in IE (fixes CMS #791)

Including this plugin seemed like the most complete solution to this
problem, and allows it to be removed when tinymce is upgraded (assuming
they have fixed this issue). Uses a compressed version of the
advimagescale fork from sourceforge
(http://sourceforge.net/p/tinymce/plugins/186/), as it allowed for
multiple tinymce instances.
FIX: Fixes #2389
- Prevent circular references in `GridFieldAddExistingAutocompleter` when linking DataObjects whose ID matches the current object to which the gridfield is attached.
SecurityToken docs
Merge pull request #2386 from adrexia/tinymce-image-resize

BUG: Image resize allows skewing of image in IE (fixes CMS #791)
FIX: Modified fix for #2389 to ensure existing tests pass.
Merge pull request #2343 from chillu/pulls/security-404

Returning 404 on /Security, instead of Controller.ss template
BUG Fixing SQLQuery::aggregate() adding ORDER BY when no limit.

DataQuery::initialiseQuery() will add a default sort to a query,
and when calling up an aggregate it will make a query like this
which doesn't make sense:

SELECT MAX("LastEdited") FROM "Member" ORDER BY "ID"

In this case there is no need to add the ORDER BY, and it will
break databases like MSSQL in cases such as
GenericTemplateGlobalProvider
which provides a default List() function for adding aggregates
into SSViewer template cacheblocks.

If we add a limit, however, then it does make sense:

SELECT MAX("LastEdited") FROM "Member" ORDER BY "ID" LIMIT 10

This fixes SQLQuery::aggregate() to NOT add an ORDER BY to an
aggregate call if there is no limit.
Merge pull request #2391 from halkyon/orderby_limit_aggregate

BUG Fixing SQLQuery::aggregate() adding ORDER BY when no limit.
i18n documentation - added note for caching in multi language modules
Update 2-extending-a-basic-site.md

Fixed a few wording issues and added some clarity to links eg: Tutorial One (Building a basic site)
Count, not Length
BUG: TreeDropdownField remove call to get value on search

This call was placing the id of the currently selected record into the
search box. Related to
https://github.com/silverstripe/silverstripe-framework/commit/93ea066f53
d5d2b2a19cf0dd2e9479a3fc5796f7
Merge pull request #2390 from phptek/2389

Prevent circular refs in `GridFieldAddExistingAutocompleter` when linking DataObjects whose ID == current object's ID
Merge pull request #2373 from chillu/pulls/treedropdown-searchfield-default

Default TreeDropdown to "Title" search if $labelField isn't in DB
Merge pull request #2400 from jbridson/patch-9

Update 2-extending-a-basic-site.md
Merge pull request #2401 from adrexia/tree-value

BUG: TreeDropdownField remove call to get value on search
FIX Privilege escalation through Group hierarchy setting (SS-2013-003)

See http://www.silverstripe.org/ss-2013-003-privilege-escalation-through-group-hierarchy-setting/