New build script, and now building mininet from source (#69)

* moved basic exercise to new run script

* forgot some files

* CLI output now goes to logs

* typo, and forgot topo file

* fixed net.stop() bug

* added temporary change to makefile

* typos hard

P4D2_2017_Fall/exercises/basic/topology.json

@@ -0,0 +1,16 @@
+{
+    "hosts": [
+        "h1",
+        "h2",
+        "h3"
+    ],
+    "switches": {
+        "s1": { "cli_input" : "s1-commands.txt" },
+        "s2": { "cli_input" : "s2-commands.txt" },
+        "s3": { "cli_input" : "s3-commands.txt" }
+    },
+    "links": [
+        ["h1", "s1"], ["s1", "s2"], ["s1", "s3"], 
+        ["s3", "s2"], ["s2", "h2"], ["s3", "h3"]
+    ]
+}