Update 0.1.4

This update contains the following:

• Added 2 new asteroid types
• Buffed Alien Destroyer's health and fire rate
• A-719 Mothership's Busted Shot ability now deals 5% more damage on Nightmare
• UFOs deployed by A-719 Mothership have their health, damage and fire rate buffed on Nightmare
• Enemies now take less time between maneuvering on Nightmare
• Enemy maneuver time is now affected on difficulties (+5% on Hard, +10% on Nightmare)
• Changed spaceship prices
• Changed upgrade price multipliers
• Money upgrades are now capped at +200%