Fixed two homing bullet issues

Homing is now reflected network-wide and the player can now
successfully disable the lock-on effect by middle-clicking. This fixes
issue #11. https://github.com/doctorspoof/SpaceShooter/issues/11
Fixed explosive force on asteroids not syncing

The explosive force is now applied then the game will wait for one
FixedUpdate() to synchronise the asteroid over the network to ensure
the force is applied.
Fixes asteroid velocity issues over the network

Now when asteroids spawn they wait for a FixedUpdate() before
synchronising the velocity to others. This makes asteroid positioning
over the network much more accurate too.
Changed spawn points so that random waves are used. Also added the scaling up of enemies over time
Merge branch 'MikeyBranch' into development
Merge pull request #18 from doctorspoof/peter-branch

Merged asteroid and explosive force fixes
forgot to save the scene so the changes to it were not commited
Merge branch 'MikeyBranch' into development
Hotfix for "Unable to find HealthScript" error

Code contained a silly if statement.
Potentially fixed enemies stopping after killed player. Needs testing
Merge branch 'MikeyBranch' into development
Removed the modifier on shield recharge
More controller support: Changed movement style and added zoom buttons
Fixed missile lock distance
Merge branch 'CalumBranch' of https://github.com/doctorspoof/SpaceShooter into CalumBranch