Virtual paths and VirtualPathProvider are used in dotless instead of physical file names

- Transient LESS files are supported using VirtualPathProvider;
- LessBundle is derived from StyleBundle;
- LessTransform respects dotless configuration (FileReader and Logger types, debug, other engine settings);
- LessTransform omits less transformation for plain CSS files;
- Less transformation errors properly handled;
- Web application is updated to demonstrate transient files functionality (Bootstrap theme variable.less files and custom BootstrapThemeVirtualPathProvider are added);
- System.Web.Optimization.Less assembly version changed to 1.1.0.0.
Virtual paths and VirtualPathProvider are used in dotless instead of physical file names

- Transient LESS files are supported using VirtualPathProvider;
- LessBundle is derived from StyleBundle;
- LessTransform respects dotless configuration (FileReader and Logger types, debug, other engine settings);
- LessTransform omits less transformation for plain CSS files;
- Less transformation errors properly handled;
- Web application is updated to demonstrate transient files functionality (Bootstrap theme variable.less files and custom BootstrapThemeVirtualPathProvider are added);
- System.Web.Optimization.Less assembly version changed to 1.1.0.0.
Merge branch 'master' of https://github.com/milichev/System.Web.Optimization.Less
Updated optimization and dotless nuget packages.
Added bundle where files are in different folders and have imports.
Changed so the file path resolver is reset for each file (since they could be in different folders.
Changed so we only minify when the optimization is enabled e.g. when not running in debug mode.
Merge pull request #10 from mckn/full-support-for-includes

Improved the import support
Dynamic JQuery.Globalize bundling added to demo site,
DynamicBundle added for dynamic file cache key support (both for less and script),
Fixes in DependencyCache;
dotless.source config setting defaults to LessVirtualFileReader if not properly configured,
Merge remote-tracking branch 'remotes/scott-xu/master'
Merge pull request #9 from milichev/master

LessTransform does not respect dotless configuration