fix problem with list(bool)

"filter" was used as a varname, which caused 2->3 compatibility issues when filter was replaced with list(filter.
Fixed incorrect effect in VerticalBlurEffect
update copyright year
update authors
readme revision
repair monitor module (was broken by circular import, use late import)
fix comments in pseudocode example of stencil
Merge pull request #2110 from voen/patch-6

README revision
Merge pull request #2108 from voen/patch-4

Update copyright year
Update filechooser.py
Merge pull request #2106 from sirpercival/patch-1

Fix problem with list(bool) in filechooser.py
doc: added reference to packaging-ios-compile.rst
Merge branch 'master' of https://github.com/kivy/kivy
Mention <app_name> folder creation in user_data_dir docs
correct typo
Merge pull request #2109 from voen/patch-5

update authors
Fully fixed effectwidget.py doc
Enable twitter analytics for docs
Merge pull request #2116 from voen/patch-8

Enable twitter analytics for docs
Merge pull request #2091 from matham/listview-size

Use dp for filechooserlistview instead of sp.