Adds IE test for css expressions
Update README.md

Code formatting.
Revert "adding tests for string length function"

This reverts commit eccfdf4fffdd8cb9ac8cc0833f37eb6566198e3f.
adding string length function tests
Merge pull request #15 from rmariuzzo/patch-1

Update README.md
Merge pull request #13 from mgreter/master

Adds IE test for css expressions
Merge pull request #17 from wonja/str_length_tests

Str length tests
adding BEM selector tests
Merge pull request #18 from wonja/bem_selector_tests

adding BEM selector tests
string insert, index, slice, and case conversion tests
Merge pull request #19 from wonja/str_function_tests

yay even more stuff

string insert, index, slice, and case conversion tests
Interpolants in css imports tests
Merge pull request #20 from wonja/interpolants_in_css_imports_tests

Interpolants in css imports tests
wrapped pseudo selector tests
Tests for allowing a trailing comma at the end of a list
Merge pull request #21 from wonja/wrapped_pseudo_selectors

wrapped pseudo selector tests
Merge pull request #22 from wonja/trailing_comma_list

Tests for allowing a trailing comma at the end of a list
tests for interchangeability of - and _
Merge pull request #24 from wonja/interchangeable_hyphens_underscores

tests for interchangeability of - and _
tests for escaped quotes