Wrote tests for VariableNode.
Wrote tests for ObjectMethodCallNode.
Wrote tests for BinaryOperationNode.
Created StatementNode::getLineCount() and test.
Fixed StatementNode::getLineCount().
Fixed obi-wan error in getLineCount().
Changed the getLineCount() test to a nowdoc.
Added a getLineCount() test for a multi-line function call.
Merge pull request #85 from grom358/getLineCount

StatementNode::getLineCount()
Added ability to create line block comments
Added CommentNode::create()
Created a (broken) toComment() method in StatementNode.
Created UncommentTrait for uncomment() method, and a (failing) test.
Only trim the immediate space after //
Merge pull request #87 from grom358/statementToComment

Statement to comment
Added TrueNode, FalseNode, NullNode
Added NamespaceNode::create()
BUGFIX: php open tag includes the following whitespace
Added NodeCollection::reduce()
Added is, index, and get methods to NodeCollection