Merge pull request scratchfoundation#54 from kchadha/remove-gzip-js

refactor(unzip): remove support for gzip files

Merge pull request scratchfoundation#52 from mzgoddard/waterfall-into…

…-promise

Replace the async.waterfall in index with a Promise chain

Merge pull request scratchfoundation#53 from kchadha/remove-control-c…

…hars

fix(parse): remove backspace control characters from input to be parsed

Merge pull request scratchfoundation#51 from chrisgarrity/handle-sb2-…

…nested-zip

fix(unzip): handle sb2 files zipped with a folder

Merge pull request scratchfoundation#50 from kchadha/allow-sprites-na…

…med-stage

Allow sprites named stage

Merge pull request scratchfoundation#46 from kchadha/fix-comment-posi…

…tion-validation

fix(sb3_definitions): fix comment position validation

Merge pull request scratchfoundation#45 from kchadha/fix-validation-e…

…rror

fix(sb3_definitions): fix validation error

Merge pull request scratchfoundation#44 from kchadha/layer-order-vali…

…dation

feat: add layerOrder informaiton to stage and sprites

Merge pull request scratchfoundation#43 from kchadha/comment-validation

Comment validation

Merge pull request scratchfoundation#41 from kchadha/fix-sprite2

fix(sprite2): sprite2 validation should allow sprites without sounds