fixed mixin call matching for multi-selector parent...
a few minor selector match fixes...
a few minor selector match fixes: updated tests.
update bower.json main script

for bump 1.4.2 -> 1.5.0
Check location.port for truthiness

According to the w3 spec for Window:

http://www.w3.org/TR/Window/#location

`location.port` might be null. This PR checks that it is truthy before checking for the port's length.

One place where location.port is null is within [jsdom](https://github.com/tmpvar/jsdom), so if you run less within Node, within jsdom, it throws an exception in this code.
Merge pull request #1628 from tomfuertes/patch-1

update bower.json main script
Support specifying custom variables when calling lessc and less.js.

Both lessc and less.js can now be provided with global variables that
all .less files will have immediate access to. This can be used to
provide, for example, a base path for an @import, signed URLs offering
temporary access to an image on S3, or anything else.

lessc has two new parameters, --global-var and --modify-var. Both take
a value of the form "varname=value". --global-var declares variables
immediately before the content of the .less files, and --modify-var
declares them after.

--global-var is used when rules, imports, or other variables will depend
on the provided variable.

--modify-var is used to override a variable declared within the .less
file.

less.js's equivalent for global variables is less.globalVars. This can
be set before loading less.js. There is no new requivalent to
--modify-var, as less.modifyVars can be used for that purpose.
Merge pull request #1655 from chipx86/custom-vars

Support specifying custom variables when calling lessc and less.js.
Merge pull request #1643 from matthewp/location-port

Check location.port for truthiness
Merge branch 'selector-match-fixes' of https://github.com/seven-phases-max/less.js
Change lessc exit status code on error. Fixes #1637
Add lessc parameter availability check. Fixes #1637

Conflicts:

	bin/lessc
Disable yui-compress parmeter (instead of falling back to incompatible clean-css). Fixes #1637
add options to disable clean css options that interfere with less operation. upgrade clean css
warn about using sourcemap option with clean css