Better HTTP code for method not supported

Change HTTP code to raise from 400 to 405 (Method Not Allowed).
Fix LOAD() in restful context

When you call LOAD() on a controller who has some actions decorates with @request.restful(), it fail with:
@request.restful()
TypeError: 'NoneType' object is not callable
=> because LOAD use other_request variable who are a Request but without all methods and therefore without restful method.
I've just mock the restful method but I think that the real restful method will be better...
Prevent error in restful decorator from swallowing up stacktrace
S/Mime (X.509) keyfile, sign_certfile, sign_chainfile, crypt_certfile can be strings.
mail.send() function can set signing and encryption settings.
Inject restful method for LOAD()

Better solution than my last commit for the restful method by inject the real restful method.
We can now call LOAD() on a @request.restful() decorated action.
Fix IS_STRONG used with validate_and_update

Fix no error return with IS_STRONG validator because it returns a gluon.html.XML instead of str, so when pushed to response.errors that is a Row, it isn't display because Row object filters his output and doesn't support XML objects.
Merge pull request #440 from dokime7/patch-2

Better HTTP code for method not supported
Merge pull request #441 from dokime7/patch-3

Fix LOAD() in restful context
Merge pull request #442 from bunnyhugdev/master

Prevent error in restful decorator from swallowing up stacktrace
Merge pull request #443 from szimszon/master

Easier S/Mime (X.509)
Merge pull request #445 from dokime7/patch-4

Fix IS_STRONG used with validate_and_update
Add support of --folder paramter for cron.
Before this changes crontab from directories (except native applications) was ignored
Delete git

unneeded file
fix cron hang on Ctrl+C terminating from terminal
fixed excessive attribute sanitization in generic generation of PDF (pyfpdf)
Terminate subprocesses right way on cronstop
Merge branch 'master' of https://github.com/jmistx/web2py
Merge pull request #446 from jmistx/master

Add support of --folder paramter for cron.
Merge pull request #447 from reingart/master

fixing pypdf table rendering issues due attribute sanitization