Change details view step to use selection-change instead of click.
fix typo in jsdoc
Setting idProperty is not needed any more since https://github.com/ibm-js/deliteful/issues/255 is fixed.
Removed link to runnable demo for part8-1, as all runnable apps are already using build versions.
Add a single part8 runnable link that points to the fully built (layer) demo.
Add Button unit and functional tests.
Fixes https://github.com/ibm-js/deliteful/issues/70.
Update tutorial docs to reflect move of width100/height100 CSS classes to deltite/themes/defaultapp.css
Refs https://github.com/ibm-js/deliteful/issues/310, https://github.com/ibm-js/deliteful/issues/319
Remove LinearLayout Widget inheritance since it's already retrieved from DisplayContainer