db._drop doesn't work correctly

[moonglum]

Snippet from the Unit Test:

db._drop(vertex);
db._drop(edge);

graph = new Graph(vertex, edge);

First Run: Everything is ok, second run:

[AvocadoError 1108: cannot create/rename collection because directory ready exists: cannot create collection]

[moonglum]

avocsh> var Graph = require("graph").Graph;
avocsh> graph = new Graph("UnitTestsCollectionVertex", "UnitTestsCollectionEdge");
JavaScript exception in file '/graph' at 726,29: TypeError: Expecting a function in instanceof check, but got false
!  if (! vertices instanceof AvocadoCollection) {
!                            ^
stacktrace: TypeError: Expecting a function in instanceof check, but got false
    at new Graph (/graph:726:29)
    at (shell):1:9

[fceller]

Fixed in 1.0.alpha1