coursier should try all resolvers for missing classifiers

This is kind of shitty, but I would like that all resolvers be tried if a classifier is missing.

E.g.

"com.viewpagerindicator" % "library" % "2.4.1" artifacts(Artifact("library", "aar", "aar"))

is not available at http://repo1.maven.org/maven2/com/viewpagerindicator/library/2.4.1/

however, it is resolved at http://dl.bintray.com/populov/maven/com/viewpagerindicator/library/2.4.1/

Ivy seems to do this automatically, and so does gradle.

[2m]

This is also a problem with a new Google repository (resolvers += "Google" at "https://maven.google.com"). For example "android.arch.lifecycle" % "extensions" % "1.0.0-alpha3" is not resolved as an aar. I get the following error:

[error] (*:update) coursier.ResolutionException: 3 not found
[error]   https://maven.google.com/android/arch/core/core/1.0.0-alpha3/core-1.0.0-alpha3.jar
[error]   https://maven.google.com/android/arch/lifecycle/extensions/1.0.0-alpha3/extensions-1.0.0-alpha3.jar
[error]   https://maven.google.com/android/arch/lifecycle/runtime/1.0.0-alpha3/runtime-1.0.0-alpha3.jar

Jar is not there, but aar is.

[2m]

This has been fixed. Can be closed now.