V1.5 for KSP 1.2.2

v1.5 for KSP 1.2.2 - 19/04/2017

• (Issue #5 fix) : NRE when PartStats{} node is absent from PartStatsUpgradeModule bug
• (Issue #4 fix) : ModuleDataTransmitter (and others) doesn't revert to base stats bug
• (Issue #3 fix) : Incorrect state of upgrades at init bug