Some minor clean-up.

Added package info to support packages.

twelvemonkeys-imageio/core/src/main/java/com/twelvemonkeys/imageio/spi/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Provides helper classes for service provider implementations.
+ */
+package com.twelvemonkeys.imageio.spi;

twelvemonkeys-imageio/core/src/main/java/com/twelvemonkeys/imageio/stream/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Provides various additional stream implementations.
+ */
+package com.twelvemonkeys.imageio.stream;

twelvemonkeys-imageio/core/src/main/java/com/twelvemonkeys/imageio/util/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Provides various common utilities for reading and writing images.
+ */
+package com.twelvemonkeys.imageio.util;