Update ProgressBar.md

Fix embedded sample iframe height
ScrollableContainer: doc fix
Toaster.md fixes (markdown syntax and forgotten .html extension)
Addition of ScrollableContainer.md
Select: fix in code example
Addition of Select.md
Fix missing blank in 3 .md files
Simple sample for ScrollableContainer
Doc fixes
Fix broken link on ibm-js.github.io
User doc of ScrollableContainer and Select: title capitalization
Added screenshots to ScrollableContainer.md
ScrollableContainer.md: small formatting improvement
Cosmetic improvements
deliteful/Select sample: small cosmetic improvement
User doc of Select: added screenshots
Prepare for 0.2.0-dev tag
Select and ScrollableContainer: added jsfiddles
SidePane functional testing, refs #25
SidePane: fix prog. instantiation + unit test, refs #25