do dynamic lookup of Repo source for custom imports

[dmitris]

trafficstars

Fix https://github.com/Masterminds/glide-report/issues/6

Added unit tests for Remote() function with packages that require dynamic resolution.

[mattfarina]

Gah, ok... i'll look at this soon. thanks.

[dmitris]

@mattfarina - did you have a chance to check this? I'd love to use glide-report to check for the updates.

[dmitris]

i'll look at this soon. thanks.

@mattfarina - wanted to follow up on this; would really like to have functional glide-report, would be very useful for us 😄