Monkey with process forking for Windoze

There were several problems to fix. 1) a bug in the
JDK (1.7 up to 7_60):

https://bugs.openjdk.java.net/browse/JDK-8023130

which we can work around by detecting buggy VMs and not trying
to use inheritIO. 2) File<->URL conversion is platform dependent
and we shouldn't make any assumptions. The problem in this case
was that file URLs contain a ":" so they can 't be added to a
path in UNIX, but on Windows you need the absolute path with the
colon. Solution: use Files on the classpath for spring-boot:run.

Hopefully also fixes gh-767

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/RunMojo.java

@@ -160,8 +160,9 @@ public class RunMojo extends AbstractMojo {
 			StringBuilder classpath = new StringBuilder();
 			for (URL ele : getClassPathUrls()) {
 				classpath = classpath.append((classpath.length() > 0 ? File.pathSeparator
-						: "") + ele);
+						: "") + new File(ele.toURI()));
 			}
+			getLog().debug("Classpath for forked process: " + classpath);
 			args.add("-cp");
 			args.add(classpath.toString());
 		}