GitIgnore Attempt #2

Made some changes to the .gitignore file, adding UnityHolodeckProject/
to the start of all the things it’s supposed to ignore. Hopefully this
actually gets it to ignore things;
Merge branch 'master' of https://github.com/University-of-Illinois-Holodeck-Group/Holodeck

Conflicts:
	UnityHolodeckProject/Library/CurrentLayout.dwlt

UnityHolodeckProject/Library/ScriptAssemblies/Assembly-CSharp-Editor.dll

UnityHolodeckProject/Library/ScriptAssemblies/Assembly-CSharp-Editor.dll
.mdb
	UnityHolodeckProject/Library/ScriptAssemblies/Assembly-CSharp.dll
	UnityHolodeckProject/Library/ScriptAssemblies/Assembly-CSharp.dll.mdb
	UnityHolodeckProject/Library/assetDatabase3
	UnityHolodeckProject/Library/expandedItems

UnityHolodeckProject/Library/metadata/c9/c9d2ea2e435b2374b8fc71a3b8c1867
8
	UnityHolodeckProject/UnityHolodeckProject-csharp.sln
	UnityHolodeckProject/UnityHolodeckProject.sln
	UnityHolodeckProject/UnityHolodeckProject.userprefs