Create log_dir path directories recursively

This change will create the custom log folder and its parents, if needed, in the case of using absolute paths too.
Update urlrequest.py

Added '''and the response
to the request will be accessible as the parameter called "result" on the callback
function of the on_success event.'''.
Remove strange chars.
Add note about twisted on iOS
Merge pull request #2237 from matham/joy

Remove strange chars.
Merge pull request #2240 from bionoid/twistednote

Add note about twisted on iOS
doc: corrections to 'Scatter.transform' behaviour
Fix incorrect attr links in uix/settings
Merge pull request #2241 from bionoid/settingsdocs

Fix incorrect attr links in uix/settings
Fixed effectwidget to work as RelativeLayout
Merge pull request #2242 from inclement/efw_fixes

Fixed effectwidget colour and translation problems
Change effectwidget to work with bg alpha
Added overlap and bgcolor control to efw example
Fixed several effects to honour background alpha
Merge pull request #2243 from inclement/efw_bg

Changed effectwidget to work with any background_color
doc: tweaks to grammar for the Scatter
doc: added reference to sphinx docs for more detail
doc: added link to kv lang for examples
doc: added references for Shader and Audio, 80 col reformatting
doc: link to Stencil docs, 80 col stuff