Create mechanism for implementing vesicle models

[murrayrm]

One of the things we want to do is being able to do is set up reactions that correspond to TX-TL running in vesicles. One way to do this might be to create a set of commands that look something like this:

mastermix = txtl_combine([tube1, tube2, tube3]);   # create master mix
Mobj = txtl_create_vesicle(mastermix);                 # create system with vesicle, environment
txtl_addspecies(Mobj.env, 'aTc', 10);                     # add inducer to invironment
...
[simData] = txtl_runsim(Mobj,configsetObj); 

@MiroGasparek: you might want to comment on this.

[miroslavgasparek]

The first version of model for setitng up reactions in the vesicle containing various subsystems through their interconnection using the proposed syntax has been created in SimBiology.

Fine-tuning and TX-TL implementation will hopefully follow as next steps.