- Added Process.getPid() and Terminal.isTerminal().

- Added a test command-line app.

src/test/groovy/net/rubygrapefruit/platform/TerminalTest.groovy

@@ -0,0 +1,16 @@
+package net.rubygrapefruit.platform
+
+import org.junit.Rule
+import org.junit.rules.TemporaryFolder
+import spock.lang.Specification
+
+class TerminalTest extends Specification {
+    @Rule TemporaryFolder tmpDir
+    final Terminal terminal = Platform.get(Terminal.class)
+
+    def "can check if attached to terminal"() {
+        expect:
+        !terminal.isTerminal(Terminal.Output.Stdout);
+        !terminal.isTerminal(Terminal.Output.Stderr);
+    }
+}