Travis: Automatically test KS submissions

With @sircmpwn's permission, this should download and test any mod from
KerbalStuff. This is only triggered on PRs, and will automatically fetch
the latest stable netkan.exe for testing.
Travis/KerbalStuff: Test against the branch we're merging into.
Netkan/KS errors are more verbosely reported.
Travis: Also test github releases.
Skip inflate tests if no .netkan files have changed.
travis: Really mark test as skipped if no .netkan files changed.
DangIt recommends Entropy again
Merge pull request #187 from Ippo343/master

DangIt recommends Entropy again
Adding EnhancedNavball
Rename EnhancedNavball.netkan to EnhancedNavBall.netkan
Change DeadlyReentry version to 0.90
Updated version, Added Repo.
Merge pull request #192 from playful1510/patch-1

Updated version, Added Repo.
Updated RCSLandAid.netkan
Added ksp_version, homepage
0.90
Merge pull request #196 from playful1510/patch-1

Added ksp_version, homepage
Added ksp_version, homepage
Added repo
Merge pull request #177 from pjf/better_ks_travis

Travis: Test KS and Github releases with netkan.exe