Adds logging when failure to match user agent string
Merge branch 'rebar-2.3' of github.com:bedatadriven/rebar into rebar-2.3
Merge branch 'rebar-2.3' of github.com:bedatadriven/rebar into rebar-2.3
Improved Less stylesheet support, and new IconSet generator

- Upgraded to less 1.7.0
- Removed linker (it wasn't a good approach) - Stylesheets now use the same injection
  mechanism as GWT's CssResources