rm example directory
rename example directory to docs
remove uesless example
add convert test case
add scale image example
Add vender
add scale image test cases
add convert package testdata
refactor the convert package
add Example
Remove windows build
Add Converalls Badge
Update travis ci config file to support converalls
Add Cover badge
Test sub packages
Add test case cover
Add godoc badge
Add if colored the char test
Add ascii package test cases
Add ascii package test case