Added a 'Domain' in Chaining

[ccpandhare]

What this PR contains

For simpler usage of Image Sequencer, we allowed chaining in methods.
So there arose am ambiguity as to what the following line of code should mean:

sequencer.loadImage(PATH).addSteps(STEPS).run();

Before

Before this pull request, what this code did was:

• Create a new Image from the given PATH
• give it the name "default"
• addSteps STEPS to ALL images.
• run the sequencer.

In short, addSteps and other modules, according to the definition in README.md, used to by default affect ALL images. This was sensible before we allowed chaining.

After

But now, what I propose in this PR is that, methods chained after loadImage() must only affect the newly loaded images. So the above piece of code will now mean:

• Create a new Image from PATH
• give it a random name like "image1"
• addSteps STEPS to the newly loaded image.
• run the sequencer on THAT image.

As you can see, the code is more intuitive now. Also I have added Automatic Image Naming like "image1", "image2", "image3", etc.

I have also forbidden chaining any methods after run() as the method will be called before run completes.

[ccpandhare]

This resolves #48

[ccpandhare]

I have tried to explain this in detail. If I have not explained something in a proper manner, please let me know :-)

[jywarren]

This sounds good. I think if we link to this description in the README and after addsteps and other chainable methods we write a shorter version like "Be aware that when chaining (see _chaining_), the passed steps are applied only to the image passed via chaining, and not cached or applied to other saved images."

…

On Jul 10, 2017 9:36 AM, "Chinmay Pandhare" ***@***.***> wrote: I have tried to explain this in detail. If I have not explained something in a proper manner, please let me know :-) — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#53 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABfJ4Ws5iTHW0f9uzdbN5CDw84mxpi2ks5sMii9gaJpZM4OS15p> .

[ccpandhare]

Yes that's right! I have added this to the README.md under a new section "Chaining".

[jywarren]

Perfect! Then, looks good to me!

…

On Jul 10, 2017 9:48 AM, "Chinmay Pandhare" ***@***.***> wrote: Yes that's right! I have added this to the README.md under a new section "Chaining". — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#53 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABfJ-5-vkBQ1VHaoEvYHdxVTn2FZLqwks5sMiu8gaJpZM4OS15p> .

[ccpandhare]

Merging!