@hoabanmc/ng2-pdfjs-viewer (npm): 1. **Add close buttton**  2. **Download with root url**  3. **If file pdf( convert from docx, doc...) loaded errors. Using [docs.google.com] to view it**    If using many component *ng2-pdfjs-viewer* in one page, need refresh component *ng2-pdfjs-viewer* 
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