Support to invokedynamic bytecode

Introduced in jdk7 and used, by java language, in jdk8 with lambda expressions
It throws an exception with an invalid tag(18 invokedynamic)

Follow some logs:

Without lambda(invokedynamic):
Indexed br.com.janario.jdk8.Test$1 (0 annotations)
Indexed br.com.janario.jdk8.Test (0 annotations)
Wrote 7.idx in 0.0180 seconds (2 classes, 0 annotations, 0 instances, 99 bytes)

With lambda:
ERROR: Could not index Test.class: Unknown tag! pos=1 poolCount = 61
java.lang.IllegalStateException: Unknown tag! pos=1 poolCount = 61
	at org.jboss.jandex.Indexer.processConstantPool(Indexer.java:603)
	at org.jboss.jandex.Indexer.index(Indexer.java:637)
	at org.jboss.jandex.Main.scanFile(Main.java:146)
	at org.jboss.jandex.Main.scanFile(Main.java:135)
	at org.jboss.jandex.Main.indexDirectory(Main.java:101)
	at org.jboss.jandex.Main.execute(Main.java:69)
	at org.jboss.jandex.Main.main(Main.java:52)
Wrote 8.idx in 0.0140 seconds (0 classes, 0 annotations, 0 instances, 8 bytes)