Add specs for issue 614
Merge pull request #122 from xzyfer/wip/issue_614

Add specs for issue 614
Add specs for issue 615
Merge pull request #123 from xzyfer/wip/issue_615

Add specs for issue 615
Add specs for issue 617
Merge pull request #124 from xzyfer/wip/issue_617

Add specs for issue 617
Activate specs for issue 617
Merge pull request #125 from xzyfer/wip/activate-issue-617

Activate specs for issue 617
Adds spec test for libsass issue 623 (todo)

https://github.com/sass/libsass/issues/623
Merge pull request #128 from mgreter/issue/todo/623

Adds spec test for libsass issue 623 (todo)