Rewrite of MultiBackend driver with separate functions for all ILS driver methods. Fix to checkCapability to work properly with drivers using __call() magic method and more data to supportsMethod() for better decision-making including the possibility to use supportsMethod also without _call(). Updated MultiBackend tests.
Updated comments.
Style fix.
Bootstrap 3 JS checkstyles.
Merge branch 'release-2.3'
Bootstrap 3 checkstyle part 2.
Bootstrap 2 JS checkstyles.
Merge branch 'release-2.3'
Bootstrap 2 JS checkstyles part 2.
Blueprint JS checkstyles.
Merge branch 'release-2.3'
Blueprint JS checkstyles part 2.
Include modification times in JS/CSS URLs to avoid unwanted caching
- Resolves VUFIND-1028.
Bootstrap 3 JS checkstyle part 3.
Merge branch 'release-2.3'

Conflicts:
	themes/bootstrap3/js/hierarchyTree.js
Merge branch 'master' of https://github.com/vufind-org/vufind
Less Compiler test.
Less Compiler test part 2
Fixed default property value.
Fixed line endings.