modules: Drop IssueTracker.SelectActiveStoryIds

Not needed right now, let's implement it properly when we need it.

Change-Id: 1e6a19144d
Story-Id: SF-100
pivotal: Comment out old code

Comment out the code that is old and needs to be updated. Panics were
put to the places to make sure the old implementation is never used and
SalsaFlow panics to signal the implementation is missing.

Change-Id: e07effcebf
Story-Id: SF-100
pivotaltracker: Don't use gopkg.in for PT module

No need really since the library is absolutely not stable yet.

Change-Id: e1d5ad0455
Story-Id: SF-100
repo bootstrap: Add pivotal_tracker support

Add the Pivotal Tracker section into the local configuration file
template.

Change-Id: c9f76650f7
Story-Id: SF-100
pivotaltracker: Make sure story start works

And also, make the module compile against the current interfaces!

Sorry, the patch is a bit mess, it is all that was necessary to be
aligned for the module to start working again.

Change-Id: db6da78d85
Story-Id: SF-100
Merge branch 'story/pt-story-start' into develop