Added bugtracker to the spec and schema

For #114
Fixed license on RetroFuture.

KerbalStuff allows for free-form license fields, and the CKAN gets
unhappy if these don't exactly match what's in our spec. This
overrides the detected field with the actual CKAN-friendly license.
Merge remote-tracking branch 'origin/master' into 114_bugtracker

* origin/master: (44 commits)
  Document magic numbers in Linux detection.
  Documented what flipping enabled does in the Main GUI class.
  TransactionalFilesystem: Documented possible bug.
  Moved NetAsyncDownloader to its own file.
  ModuleInstaller: TODO: Break this into smaller pieces.
  ModuleInstaller: Documented inter-thread communication
  Module has consistent To/From Json/File methods.
  CmdLine: Add back `--kspdir` option.
  RegistryManager.Instance() now always requires a path.
  Cmdline: Remove now obsoleted 'config' option.
  Provide a stack backtrace in the GUI before calling Debugger.Break()
  GUI: Check our KSP install hasn't been set on the command-line.
  Not finding a gamedir when expect is no longer a fatal warning.
  Major overhaul of multi-instance KSP
  Accessing .Instances always makes sure it's loaded now.
  Populated GameData in test dir to make git happy.
  Added tests for IsKspDir() and test data.
  Test framework organisation overhaul.
  Fix verson detection and validation of KSP gamedir
  TODO: Less steps in cmdline for new instance setup.
  ...
Added resources.bugtracker to CKAN.Module.

- Added `bugtracker` resource
- Flipped homepage to Uri
- Flipped github.url to Uri
- Added tests.

Includes #135.
Closes #114.
Merge pull request #143 from pjf/fix_retrofuture

Fixed license on RetroFuture.
Merge pull request #148 from pjf/114_bugtracker

Added resources.bugtracker to CKAN.Module.
Configure travis to attach executables to github releases

Alas, we can't do this and have S3. Silly travis.
Exclude flaky network tests from being run by travis.

These can ruin our day if they fail bogusly.
Merge pull request #149 from KSP-CKAN/travis_releases

Travis releases
Added Kerb-fu to the BootKAN.
Fix multi-instance bug
Merge pull request #155 from AlexanderDzhoganov/master

Fix multi-instance bug
Merge pull request #153 from pjf/netkan_kerbfu

Added Kerb-fu to the BootKAN.