Update compile.sh

Update bash script to specify c++ standard.

src/compile.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
 #Don't know cmake so here's a simple bash script for compiling
-g++ -c Directory.cpp -o Directory.o
-g++ -c Functions.cpp -o Functions.o
+g++ -std=c++11 -c Directory.cpp -o Directory.o
+g++ -std=c++11 -c Functions.cpp -o Functions.o
 g++ Functions.o Directory.o Main.cpp -o File-viewer