javadoc updates
travis-ci link
trace logging
temporarily change log level
change log level back
fix github links
whitespace
comment fix
ability to get a context node's ancestor at any depth
work on signatures
setting log configuration only for tests
temporarily disabling this test
temporary fix for signatures
renewed generic magic in context node types
fixed datatypes support
more work on signatures and contributors
more work on signatures, plus added unit test
small signature API fix
updated XDI signer tool
better variable matching