Allow for certain repositories to be ignored entirely

[erichoracek]

Some repositories use Carthage as a simple mechanism to include other git repositories that do not produce frameworks. Even Carthage itself does this, to include xcconfigs.

To accommodate for this existing paradigm, Rome should allow for certain repositories to be omitted entirely from the upload/download/list commands.

One could imagine that this would be an addition to the Romefile, along the same lines as the existing RepositoryMap section. Perhaps it could be named something along the lines of Ignored.

As a hypothetical example, let's imagine the following:

Cartfile:

github "Quick/Nimble"
github "jspahrsummers/xcconfigs"

Romefile:

[Ignored]
    xcconfigs

We then perform the following commands:

$ rome upload
Successfully uploaded Nimble to: Nimble/Nimble.framework-5.0.0.zip
Successfully uploaded Nimble to: Nimble/Nimble.framework.dSYM-5.0.0.zip

$ rome list
Nimble 5.0.0 ✔︎

$ rome download
Donwloaded: Nimble.framework-5.0.0.zip
Unzipped: Nimble.framework-5.0.0.zip
Donwloaded: Nimble.framework.dSYM-5.0.0.zip
Unzipped: Nimble.framework.dSYM-5.0.0.zip

Note that xcconfigs was never included in any of the hypothetical output.

Current Behavior:

Currently, in scenarios like these, users have to manually filter out repositories that fall into this category, since otherwise they will always show up when invoking rome list --missing.

While less of a hassle, this also pollutes the output of the download command with errors that will never be resolved:

$ rome download
...
Error downloading xcconfigs.framework-cc451b08e052b6146f5caf66bc1120420c529c7b.zip : The specified key does not exist.
Error downloading xcconfigs.framework.dSYM-cc451b08e052b6146f5caf66bc1120420c529c7b.zip : The specified key does not exist.

[tmspzz]

Sounds good.

[tmspzz]

@erichoracek Some clarification is needed

In the light of #30 adding an ignore section will look like this:

[RepositoryMap]
    awesome-cats = Caturday, CatCore

[IgnoreMap]
  xcconfigs = xcconfigs
  awesome-cat-names = CatCore

This allows selective ignoring when using aliases #12

Can this do?

[erichoracek]

@blender sure, this will work

[tmspzz]

@erichoracek please try pre-release v0.7.1.13

[tmspzz]

@erichoracek seems to work as expected over here, do you have any input?

[erichoracek]

@blender Appears to be working perfectly—thanks for taking a stab at this. Rome has been a joy to use.

[tmspzz]

Thanks, maybe you have input on #38