Merge pull request #111 from calamitas/master

Allow specifying relationship type for batch get_node_relationships
Use is_a? instead of inspect to cater to subclasses of Neography::Node
Check for subclasses of Neography::Node and not just an instance.
Merge pull request #112 from ujjwalt/patch-1

Use <= instead of inspect to cater to subclasses of Neography::Node
Bump to 1.2.2