Added Invoke-ReflectivePEInjection

Another awesome addition from Joe Bialek. Invoke-ReflectivePEInjection
is a vast improvement over Invoke-ReflectiveDllInjection. It adds the
following features:

* Now supports loading exe files in memory
* Supports reflective dll injection into a remote process
* Additional sample Visual Studio solutions

CodeExecution/Invoke-ReflectivePEInjection_Resources/Shellcode/x86/ExitThread.asm

@@ -0,0 +1,13 @@
+[SECTION .text]
+global _start
+
+_start:
+	; Set a var to 1, let PS know the EXE is exiting
+	mov ebx, 0x41414141
+	mov [ebx], byte 0x01
+
+	; Call exitthread instead of exit process
+	sub esp, 0x20
+	and esp, 0xFFFFFFc0 ; Needed for stack alignment
+	mov ebx, 0x41414141
+	call ebx