test picturre quality
fix travis
improve format performance
remove gmagick.size
remove gmagick.generate
refacoring gmagick.resize
remove gmagick.crop
refactoring gmagick.addText
refactoring gmagick.mosaic
refactoring gmagick.composite
change gmagick.resize signature
change gmagick.addText signature
change gmagick.mosaic signature
change gmagick.composite signature
parallel 3 preview pic composite
change preview picture size
Merge branch 'anthpack-v2' into release/v2.0.1

* anthpack-v2:
  change preview picture size
  parallel 3 preview pic composite
  change gmagick.composite signature
  change gmagick.mosaic signature
  change gmagick.addText signature
  change gmagick.resize signature
  refactoring gmagick.composite
  refactoring gmagick.mosaic
  refactoring gmagick.addText
  remove gmagick.crop
  refacoring gmagick.resize
  remove gmagick.generate
  remove gmagick.size
  improve format performance
  fix travis
  test picturre quality
update package.json
lower case package name