Changes since last update:
#4621 Setting empty tooltips for zoom select box items
#4628 Ensure that the errorWrapper is closed when a new document is opened (issue 4625)
#4622 version 1.0.21
#4607 Remove a bunch of unused local variables from web/ and src/
#4552 Prevent the annotationLayer from being recreated when the page is redrawn
#4538 Less copying in the JPX decoder
#4633 Fixes spacing in the text layer builder
#4636 Rename getUint32 to getInt32 and collect readInt*() in util.js
#4640 Fix special powers add-on for firefox.
#4637 Fix #3483 and simplify readCodingpasses()
#4638 Recognizes ASCII type1 encoding
#4641 Fixes invalid CFF name for Mac OSX
#4646 Update of zh-TW
#4644 Add Attachment strings to the Swedish l10n
#4656 Fix regression preventing the setting of breakpoints in the Stepper (PDFBug)
#4653 Fix corrupted images #4649
#4655 Add integer conversion to RGB colour values in convertToRgb in DeviceCmykCS (issue 4443)
#4654 Basic node.js example that demonstrate pdf.combined.js file use
#4600 Optimized JPX decoder ~6% faster