Sass color functions are not case insensitive #214
Description
In [12]: sass.compile(string='a { b { color: lighten(crimson, 10%); } }')
Out[12]: u'a b {\n color: #ed365b; }\n'
But if you use uppercase letters in colors (allowed by CSS specification), it fails :
In [13]: sass.compile(string='a { b { color: lighten(Crimson, 10%); } }')
---------------------------------------------------------------------------
CompileError Traceback (most recent call last)
<ipython-input-13-2066632bd1a9> in <module>()
----> 1 sass.compile(string='a { b { color: lighten(Crimson, 10%); } }')
/usr/local/lib/python2.7/dist-packages/sass.pyc in compile(**kwargs)
638 raise TypeError('something went wrong')
639 assert not s
--> 640 raise CompileError(v)
641
642
CompileError: Error: argument `$color` of `lighten($color, $amount)` must be a color
Backtrace:
stdin:1, in function `lighten`
stdin:1
on line 1 of stdin
>> a { b { color: lighten(Crimson, 10%); } }
---------------^
Sass Ruby version is working well with some uppercase syntax.