Sync template-parser files

The template-parser files were not in sync, there were some lines added
in SSTemplateParser.php from 3334eafcb1c42b917dcafe46d87ea32f2b1014b8
and 0a9f3b75a9195092ff7c42265ec066339d8f8aa3 , I readded those parts
into the SSTemplateParser-include-file and recreated the
SSTemplateParser.php to get to a synced state...
Remove reference to /images/flush. 

Now a BuildTask. See /dev/tasks
FIX: Ensure FieldList::push() doesn't eliminate key
Merge pull request #1728 from wilr/open6445

FIX: Ensure FieldList::push() doesn't eliminate key
FIX: remove_extension should work on parameterized extensions
Merge pull request #1727 from wilr/open6079

FIX: remove_extension should work on parameterized extensions
API: Return a 404 error when no director rule is matched
API: add onBeforeRollback() and onAfterRollback() hooks.
Merge pull request #1730 from wilr/open5489

API: add onBeforeRollback() and onAfterRollback() hooks.
Merge pull request #1729 from ajshort/no-rule-match-404

API: Return a 404 error when no director rule is matched
FIX: Decimal field change detection.
Merge pull request #1725 from s-m/templater-parser-files-sync

Sync template-parser files
Fixed Versioned hook regression

Introduced by 5238e9cf48251f77f3fda095724990da3bee6803
Merge pull request #1731 from wilr/open5551

FIX: Decimal field change detection.