move .lessrc files to test dir
ensure that only files are globbed
updates tests and test fixtures with latest from grunt-contrib-less.
adds new test configs in Gruntfile for new sourceMap features
v0.6.0. this release adds a number of new features

- Adds `globalVars` and `modifyVars` options. See readme and Gruntfile for examples.
- Support `sourceMapURL`
- Support `outputSourceFiles`
- Support `sourceMapFilename`, `sourceMapBasepath` and `sourceMapRootpath`
- Upgrade to LESS 1.5 Support `strictUnits` option
- Support sourceMap option
- Add `customFunctions` option for defining custom functions within LESS
- Output the source file name on error
- yuicompress option now cleancss (Less changed underlying dependency)