Merge branch 'release/1.4.0' into develop
Set next snapshot version
Fix bug with throwing exception if optional file cannot be found.
Support IE conditionals.
Fix failing tests.
Support adding id to stylesheets which should be edited at runtime.
doc
Fix compilation errors.
Fail when arguments are likely mixed up.
Support conditional on inline tags.
Save original path in ManagedResource.
Remove extra package.
Initial support for defining remote and local resources in same group - 
works properly only if all remote resources are first in list.
Support defining remote and local resources in same group, in any order.
Rename field.
Extract CombineCommentLineProcessor to its own class.
Rewrite urls in css files when combining.
Handle data urls in css.
doc
doc