ignore sass cache

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
add main.css and rename includeNormalizeSCSS to includeNormalizeCSS.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
update gulp for pure css.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
not include normalize-scss for pure css.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
add default value for css framework.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
ignore gulp-plumber for pure css.

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

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