Merge pull request #9 in MMDB/medici-gwt-extractors from SEAD-507-support-7z to master
* commit '6d39aedcd1f1c6171ed33127483c01d22cc46afd': SEAD-507 delete temp folder when 7z tool has error SEAD-507 delete temp folder for uncompressed files SEAD-507 removed unused imports SEAD-507 added 7z mimetype to extension SEAD-507 added codes to create zip file for non-zip file such as 7z file SEAD-507 handling the error from 7z operation SEAD-507 replaced unzip codes with codes that uses 7z utility