Properly urlencode extension block selectors and inputs
Switched to generic whitespace for poll parsing
Fixed partially-encoded state variables in poll and getStateVar
Fixed scripts in palette running after category is switched
Fixed spacing in C blocks whose substacks end with terminals
Fixed variables named "---" not appearing in menus
Fixed formatting and dispose handling in GIF decoder
Fixed a bug
Fixed context menus showing for hidden lists on the stage
Fixed importing files with CRLF or CR line endings

Also added final LF to exported file. This is the convention.
Added button to import costume from library
Fixed bubbles not appearing at right edge of block when zoomed
Fixed watcher checkbox when hiding list from context menu
Increased minimum list watcher size
Switched to a nicer way of computing scaled width

Thanks, Shane.
Merge pull request #229 from nathan/min-list-watcher-size

Increased minimum list watcher size
Merge pull request #226 from nathan/list-watcher-checkbox

Fixed watcher checkbox when hiding list from context menu
Merge pull request #223 from nathan/bubble-zoom

Fixed bubbles not appearing at right edge of block when zoomed
Merge pull request #219 from nathan/library-import-button

Added button to import costume from library
Merge pull request #193 from nathan/hidden-context-menu

Fixed context menus showing for hidden lists on the stage