rename parameter, move TIPS, add assignment HTML

assignment/doc/TIPS.txt

@@ -0,0 +1,24 @@
+CODING CONVENTIONS
+
+1. write your methods always in the following order:
+
+    extTransition
+    timeAdvance
+    outputFnc
+    intTransition
+
+  this reflects the order in which the methods are called by the simulator:
+
+     extTransition always has highest priority (can interrupt anything)
+     timeAdvance is called before outputFnc
+     outputFnc is called right before intTransition
+
+
+2. input/output port attributes start with 'in_' and 'out_'
+
+
+TROUBLESHOOTING
+
+  - did you forget to return `self.state` from intTransition or extTransition ?
+  - did you accidentally write to `self.x` instead of `self.state.x` ?
+  - did you modify the state in timeAdvance or outputFnc (NOT ALLOWED!!)