Add #:include directive. Implement circular reference guarding and sanity checks.
Merge branch 'master' of https://github.com/kivy/kivy into kv_include

merge master before pull request
Correct example
Add option to force-include which first unloads the file and then reloads it. Check for proper extension and inclusion status before any disk access takes place. Update example.
Fbo: with_stencilbuffer parameter.
Log the version of python in use.
Merge pull request #1850 from matham/log-py

Log the version of python in use.
doc: added explanation for AsyncImage
doc: added background example to uix.widget
doc: revisions to uix/relativelayout.py
doc: fixed typos in uix/widget.py
Added index method to InstructionGroup
Update version added to 1.8.1 and remove accidental ambiguity with the inclusion list as per akshayaurora
Merge branch 'master' of https://github.com/kivy/kivy into kv_include
Merge pull request #1720 from techwiz24/kv_include

Add include directive to KV Language specification
Update layout.kv
Update test.kv
lang:Fix Doc build
doc:add argument for code-block
Fix scrolling on empty scrollview.