Grex should be able to handle bound parameters

[jbmusso]

The Gremlin extension API allows for parameters to be sent as a map bound to the script engine (see https://github.com/tinkerpop/rexster/wiki/Gremlin-Extension#gremlin-extension-api).

Grex currently does not support bound parameters, making it vulnerable to Gremlin-injection vulnerabilities (just like SQL-injections).

This issue should be addressed as soon as possible, though it may require a bit more refactoring regarding the way arguments are currently handled.

Thoughts welcome!

[jbmusso]

This has been partially added in the develop branch. Bound parameters are supported when using the string formatted version of query(). See README.md in the develop branch.

Further changes/improvements on this topic (ie. bound parameters with gRex helpers) will be reflected in this discussion.