FIX postgres can filter on non text fields

Filtering non text fields in postgres would cause the SQL to fail. This
casts the field to text before the LIKE filter.
Fixed RSS example
Merge pull request #2654 from icecaster/patch-3

Fixed RSS example
Merge pull request #2242 from torleif/3.0

FIX postgres can filter on non text fields
$manifest needs to be global for Deprecation.
Use filtered file paths in upload (fixes #2836)
NEW: Forms with invalid/expired SecurityIDs are repopulated (fixes #1891)
BUG Fix missing description element on FieldGroup_holder.ss
Merge pull request #2839 from tractorcow/pulls/3.1-fieldgroup-description

BUG Fix missing Description element on FieldGroup_holder.ss
Fixing SQLQueryTest failures on PHPUnit 3.7.30
Merge pull request #2837 from chillu/pulls/2836-upload-filename-filter

Use filtered file paths in upload (fixes #2836)
Fixed and documented SS_Datetime methods that returned formatted date/times.
Merge pull request #2840 from yearofthegus/document-datetime

Fixed and documented SS_Datetime methods that returned date and/or time
Merge pull request #2835 from kinglozzer/1891-csrf-friendly-error

NEW: Forms with invalid/expired SecurityIDs are repopulated (fixes #1891)
Merge branch '3.1'
Documented security pre announce mailinglist

See https://groups.google.com/forum/#!topic/silverstripe-dev/0mjNBaSP8vE
for details
FIX Dont pop up basic auth dialog when trying to flush and isDev=1, just redirect to Security/login like normal
Removed SWFUpload, no longer used
Merge remote-tracking branch 'origin/3.0' into 3.1

Conflicts:
	search/filters/PartialMatchFilter.php
Merge pull request #2844 from chillu/pulls/security-mailinglist-docs

Documented security pre announce mailinglist