Fixed incorrect property interpolation for certain variable types, updated tests.
Check value of elements before getting args

When parsing, mixin.call() doesn't need to look for mixin.args if there weren't any elements
Cache match elements to speed up compiler
Fix grunt test, declare i
Merge branch 'patch-7' of https://github.com/oyejorge/less.js
Fix unescaped forward slash in regex. Fixes #1827
Merge branch 'patch-6' of https://github.com/oyejorge/less.js
Merge branch 'property-interp-fix-2' of https://github.com/seven-phases-max/less.js

Conflicts:
	lib/less/parser.js
Fix bug with css guards. Fixes #1750. Fixes #1613. Fixes #1813
make selector-less css guard fold into the current selector
changelog
1.6.2 release