JSONConstructor for ASN Tree (first attempt)
Added JSON pretty-printing using gson. String values are now unwrapped.
Fixed null pointer error when handling null records. Removed WDF print out in Traversal.
Fix maven warnings in xml.pom
Merge remote-tracking branch 'upstream/master'
[suggested change] - to be compatible with the ASN at http://dvcs.w3.org/hg/prov/raw-file/0f43d8bc798c/model/ProvenanceModel.html#RecordContainer. i removed the namespace element as it should come just from the default xml schema.
Merge pull request #2 from satra/patch-1

[suggested change] container modification
asn: defined namespace declaration
Merge remote-tracking branch 'upstream/master'
asn: namespace traversal
asn: namespace traversal
asn: namespace traversal
update container dfn
update container dfn
xml: transient namespace map
xml: support for namespaces
Merge remote-tracking branch 'upstream/master'
xml: support for namespaces
Merge remote-tracking branch 'upstream/master'
qname for id in xml schema