add htmlcompressor 1.5.3 and yuicompressor 2.4.7 version.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
add htmlcompressor command

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
remove conditional comments around opening html tag.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Update README

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>