fix(libs): 3rd party library install fixes

[jkuri]

Closes #152 and various other issues installing and injecting 3rd party libs.

[jkuri]

Btw, thanks to @Brocco for helping me with new prompt texts.

[cironunes]

"with a/the package name"

missing "a/the"

[jkuri]

Thanks for noticing @cironunes, I fixed it.

[filipesilva]

It looks like there's a lot less tests now. What is the reasoning?
Just curious really.

[jkuri]

Before it was default that ng install lib-name --auto-injection injected everything that was exported the library in bootstrap script automatically. That wasn't okay, because we (if) want only providers to be injected in bootstrap script. I was testing if providers, directives, pipes were injected in a separate tests.
It would be possible to test if a directives, pipes, components were injected in auto generated component, if I know how to automatically go through prompts.
Btw, now this task goes in other way around, first injecting what and where user choose and then at the end prompts if he want providers injected in bootstrap script (if any providers in library). I think thats more reasonable and make this command really useful.

[filipesilva]

Got it. Lgtm then!

[cironunes]

minor: you can improve it to:

var allPackages = { toInstall: [], toProccess: [] };

[jkuri]

Improved. Thanks for analyzing the code Ciro, if you find anything else please just add more notes.

[cironunes]

Can move this line to the top and use existSync on it on line 49?

[cironunes]

Just added a few minor style improvements. Otherwise LGTM

[jkuri]

Fixed. Thanks.

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