Issue #199 - Implement inline source maps
Issue #199 - Add a check for null cssDestination.

It is null when QuotesKeepingInStringCssPrinter is used
Issue #199 - Use Base6 encoding instead of URL (Chrome likes it better)

Add support for basePath (less.js' --source-map-basepath)
Issue #203 - Cache the result of LessSource#toURI() in method body. The calculation may be expensive.
Issue #199 - Add a config settting for relativizing sources' paths
Issue #199 - Preserve the configuration when creating a CssPrinter from another one (copy constructor)
Issue #199 - Remove the support for basePath for now
Merge branch 'master' into 199-inline-source-maps
Merge pull request #204 from martin-g/199-inline-source-maps

Inline source maps