add new method to convert a image from filename directly

Update README.md

Update README.md

rename example images

Update README.md

add more ascii images

Update README

UPDATE README

add lufei ascii image

add example images

update README file

add convert package to convert a image to ascii matrix

update README file

add ascii package to convert a image pixel to ascii

add the resize package

add godep files

update the README and add the .gitignore

Initial commit