[FEATURE] Set Per Job --limit so that long running jobs can abort when a per task limit is hit

[evilmog]

We would like the ability to specify a hard --limit for a specific task, so per client --skip and --limit would be automatically assigned but once a specific --limit is hit for the entire task the job would stop. This allows flexibility in scheduling long running tasks.

Before you submit an issue please include the following information if you do not your issue will be closed.

• Your current Server version located at the bottom of any Hashtopolis webpage.
  latest master 0.7

• Current Client version
  latest master as of 8/13/2017 0.1.7 I think

• Your current Hashcat version
  4.2.1

• The exact task command you are trying to run.
  any tasks

• Debug output from the client by running "hashtopolis.exe -d" or with debug flag set on the python client.
  N/A

Describe your problem in as much detail as possible " It's broke " is not a description.

We would like the ability to specify a hard --limit for a specific task, so per client --skip and --limit would be automatically assigned but once a specific --limit is hit for the entire task the job would stop. This allows flexibility in scheduling long running tasks.