Feature: Memory limit for sand-box child process

Possibility to enforce memory limit on sandbox-child process. 

More information about the flag used:

What is the memory limit on a node process?
Currently, by default v8 has a memory limit of 512mb on 32-bit systems, and 1gb on 64-bit systems. The limit can be raised by setting --max-old-space-size to a maximum of ~1gb (32-bit) and ~1.7gb (64-bit), but it is recommended that you split your single process into several workers if you are hitting memory limits. [1]

[1] https://github.com/joyent/node/wiki/FAQ