API Deprecated ScheduledTask and subclasses

Base CliController or BuildTask instead, with custom cron job intervals.
MINOR: Correct exception message in constructor
Merge pull request #1196 from Instagraeme/patch-1

Correct exception message in form constructor
fixed error property $ of object is not a function

changed $ to jQuery, because without it the system would generate the following error:

Uncaught TypeError: Property '$' of object [object Window] is not a function 
Merge pull request #1202 from roed/3.1

fixed error property $ of object is not a function
Merge pull request #1195 from chillu/pulls/deprecate-scheduled-tasks

API Deprecated ScheduledTask and subclasses
FIX HTML5 parser not tracking context correctly
FIX Make ShortcodeParser#parse passthrough not error on invalid HTML
FIX ShortcodeParser#parse in < PHP 5.3.6 where saveHTML doesnt take arg
Merge pull request #1213 from silverstripe-rebelalliance/feature/shortcodes

FIX issues with new shortcode parser