0.1.1 release

we have updated to 0.1.1 

• added
  • effect for invincibility power up
  • descriptions of power ups to info menu
• bugfixes
  • corvette 2 not launching missiles
  • sb2 not stopping on correct spot
  • carriers not being able to stop if thrusts are destroyed too early
  • defence mission skipping its trigger
  • 'next page' and 'previous page' buttons sticking in the info menu
  • stars overlapping carrier boss2
  • music volume only applying on the main menu
  • pause menu abort mission allowing you to bring score to next level
  • carrier boss 2 being unkillable
  • the missile 'quest' missions not advancing past step1