Wrap more data into RetrofitError

[jonnyzzz]

Currently it reports errors like

Caused by: retrofit.RetrofitError: 404 Not Found
    at retrofit.RetrofitError.httpError(RetrofitError.java:40)
    at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:388)
    at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240)
    at com.sun.proxy.$Proxy0.artifactChildren(Unknown Source)
    at org.jetbrains.teamcity.rest.BuildImpl.getArtifacts(implementation.kt:231)
    at com.jetbrains.toolbox.feedgen.Feedgen_dsl_nightlyKt.lookupTeamCityArtifact(feedgen-dsl-nightly.kt:141)
    ... 30 more

But RetrofitError itself contains all information on what went wrong on what URL.

Let's wrap it with out exception type that have a better message with all details.

[jonnyzzz]

Can easily be implemented via

RestAdapter.Builder()
           ...
            .setErrorHandler(ErrorHandler { throw Error("Failed to connect to ${it.url}. ${it.message}", it) })

Let me know if you know any meaningful usages of the RetrofitError exception outside of the library

[shalupov]

PRs are welcome :) Actually, this library is built by Demand Driven Development