Fixed algorithm for reversing list

When length($list) is 1, floor(length($list) / 2) evaluates to 0.
Should be 1.

Fixed by adding +1 offset.
Fixed 5 function references

Fixed function references to jeet-opposite-direction
Merge pull request #311 from kamilwaheed/sass-reverse-algorithm-fix

Fixed algorithm for reversing list in Sass 3.3
Merge pull request #312 from zackcote/master

Update "-opposite-direction" to "jeet-opposite-direction" to match new namespacing  in _functions.scss.
Merge pull request #313 from kamilwaheed/sass-function-reference-fix

Fixed 5 function references
Merge pull request #1 from mojotech/master

update fork