Added unit health

Added unit healt to the project, this is done

* by adding a UnithHealth script.
* added health in the spawner
* added damage to the projectile
Made proper building collition
Merge branch 'master' of github.com:MartinSkytte/eTD
Made the tower snap to a grid and be pwetty
fixed untracked files
The game is now working!!
gitignore updated
Revert "gitignore updated"

This reverts commit ada37f192428e5fb84eac49f939ae3fd85e38a82.
Deleted example files
Target and TowerPlacement edited
TowerPlacement to int, grid style
Scenes put together!!

ekstra camera added
Merge remote-tracking branch 'origin/master'

Conflicts:

	code/Assets/AstarPathfindingProject/ExampleScenes/Example2_Terrain/Pathfinding_Terrain.asset
Prefabs for tower defence added
Merge remote-tracking branch 'origin/master' into Martin

Conflicts:
	code/Assembly-CSharp-vs.csproj
	code/Assembly-CSharp.csproj
	code/Assets/Prefabs/Units/Basic unit.prefab
	code/Assets/Scenes/towerdefence.unity
	code/Assets/Scripts/BasicProjectile.cs
	code/Assets/Scripts/UnitHealth.cs
	code/code-csharp.sln
	code/code.sln
Fixed untracked files