Add tilt dependency

Sprockets 3.x won't include it
Remove asset-url/path deprecation notices

Deprecated in 4.x, removed in 5.x

Added in ae7e785e67986389195067ba990653ebb5829b32
Exclude rails 5 builds from 1.9.3 and 2.0.0
Merge pull request #281 from rails/fix-build

Fixing build for rails/master changes
Merge branch 'master' into no-imported-directives