Add ability to ignore certain repos in .proBase?

[ajpaulson]

Currently there is the possibility of having multiple bases in ~/.proBase I would like to be able to specify certain repos in there to be ignored by pro entirely (For instance a project that has a number of submodules/dependencies - I would want to ignore any repos under it entirely).

Maybe it can be some syntax like:

~/src
!~/src/MainProject/*

In this example, all repos in ~/src including MainProject would be seen by pro but any of the submodules of MainProject would be ignored entirely.