Builtin extensions#687

Merged

cwillisf merged 6 commits intoscratchfoundation:developfrom

cwillisf:builtin-extensions

Oct 13, 2017

Commits on Oct 4, 2017

Convert pen blocks into an "internal" extension
Christopher Willis-Ford
committed
Make `loadExtensionURL` handle built-in extensions
Christopher Willis-Ford
committed
Extensions: escape HTML entities in default values
Christopher Willis-Ford
committed
Fix pen tests
Christopher Willis-Ford
committed

Commits on Oct 6, 2017

Fixups from code review
Christopher Willis-Ford
committed
Fix typo in WeDo 2.0 blocks metadata
Christopher Willis-Ford
committed