#4 Detect and handle the case where tools.jar is not provided

[Abel Muiño]

In some cases, when running the maven build through the embedder, the build will fail due to the "tools.jar" dependency can't be satisfied.

This is related to using a JRE for the build (instead of the JDK, which provides the dependency).

We should investigate this and try to provide a fix or a workaround.

This should be also added to documentation.

The problem shows up mainly on Windows (maybe Linux too, nor verified). OS X works fine, as the java runtime includes tools.jar.