Switch LED and resistor on some ascii drawing

At the nodebot workshop last weekend in Paris, Reda and I had the feeling
that some ascii schematics were probably wrong or at least confusing.
We ended up using the pngs as reference.

Somebody should probably double check though.

Author: ldng

exercises/blink_blink/problem.md

@@ -50,8 +50,8 @@ In all of your solutions you will need to:
 ## Circuit diagram
 
 ```
-           LED     330
- Pin 13 o--->|----/\/\/----o GND
+            330     LED
+ Pin 13 o--/\/\/---->|------o GND
 ```
 
 ## Components

exercises/fire_alarm/problem.md

@@ -11,8 +11,8 @@ __Build a "fire alarm" that sounds when the air temperature is more than 50°C._
 ## Circuit diagram
 
 ```
-                 LED         330
-Pin 13  o-------->|---------/\/\/--------
+                  330        LED
+Pin 13  o--------/\/\/-------->|---------
                                         |
 Pin 5   o----------------------         |
                               |         |
@@ -48,4 +48,4 @@ Pin 5   o----------------------         |
 - TMP36 - https://github.com/rwaldron/johnny-five/blob/master/docs/sensor-temperature-tmp36.md
 - Button - https://github.com/rwaldron/johnny-five/wiki/Button#usage
 
----
+---

exercises/light_switch/problem.md

@@ -6,8 +6,8 @@ __Write a program that acts like a light switch to turn an LED on and off.__
 ## Circuit diagram
 
 ```
-           LED       330
-Pin 9  o--->|-------/\/\/-----
+            330      LED
+Pin 9  o---/\/\/------>|------
                              |
 Pin 5  o------------         |
                    |         |
@@ -35,4 +35,4 @@ Pin 5  o------------         |
 - Button - https://github.com/rwaldron/johnny-five/wiki/Button#usage
 - LED - https://github.com/rwaldron/johnny-five/wiki/Led#api
 
----
+---

exercises/street_lamp/problem.md

@@ -12,8 +12,8 @@ __Build a street lamp that turns on as it gets dark.__
                    |         |
  Pin A0 o-----------         |
                              |
-            LED     330      |
-  Pin 9 o--->|-----/\/\/------
+            330     LED      |
+  Pin 9 o--/\/\/----->|-------
 ```
 
 ## Components
@@ -32,4 +32,4 @@ __Build a street lamp that turns on as it gets dark.__
 It fires a data event with the current reading of the sensor.
 The sensor value is available to the callback as `this.value`
 
----
+---