Make compatible with guava 16 and greater since closeQuietly() was removed.

See: https://code.google.com/p/guava-libraries/source/diff?spec=svnb1b0baa96f590f462acdeb19d436045c2c285512&r=b1b0baa96f590f462acdeb19d436045c2c285512&format=side&path=/guava/src/com/google/common/io/Closeables.java