Redefine nodeset to be more useful
Add an API to return the line number of a node
Adding libxml2-dev requirement in README, very simple change for now, will revamp README later to make it more informative.
Merge pull request #56 from jbowtie/better-nodesets

Redefine nodeset to be more useful ( fixes #54 )
Support retrieving unparsed entity URIs from document
Merge pull request #59 from jbowtie/unparsed-entities

Support retrieving unparsed entity URIs from document
Merge pull request #57 from jbowtie/issue-19

Add an API to return the line number of a node