add unit function. Fixes #307
Mixin guards take units into account. Fixes #855
Do not require default mixin. Fixes #926
Fix argument matching. Fixes #1036
support mixin calling when using & to stack classes. Fixes #1026
interpolation includes unit, but not quote. Use unit function to get old functionality. Fixes #782
Make sass-debug-info compatible with DevTools

In order to make the debug info compatible with
Chrome's built-in experimental Sass support:

1) The filename must be a file:// URL
2) The path must be escaped rather than quoted
Test for escaped paths
Refix tests to work on unix and windows
Add support for @namespace and namespace combinators. Fixes #408
20% of a colour is not 0.20 but 51. fixes #454. Fix from @unknownbrackets
Fix multiple scoping issues with variables. Fixes #878
Scope fix - default parameters are evaluated in the mixin scope, not the
caller scope. Fixes #973.
detect parse errors, even with an import. fixes #1053
Report error for under-matched as well as overmatched braces
Fix tests and report error at index -1 so it is a valid index
Allow escaped charcaters in less filename url. Fixes #982
Updating parser to allow dimensions starting '+'

According to http://www.w3.org/TR/CSS2/syndata.html#numbers,
numbers may start with a '+'.
Also updates the test suite to include at least one dimension
starting with '+'
less element (sheet) might not be located in head
do not divide by 100 when doing maths and keeping the %. Fixes #1069