Markdown formatting (#11)

* Fixed heading formatting so it displays correctly in Github, improved formatting for code blocks

* Code formatting for square brackets

cheat-sheet.md

@@ -1,20 +1,21 @@
-##Regular expressions (RegExp): 
+## Regular expressions (RegExp): 
   a way to describe patterns in string data. They form a small, separate 
   language that is part of JavaScript and many other languages and tools. 
   RegExps are a powerful tool for inspecting and processing strings. 
   Properly understanding regular expressions will make you a more effective 
   programmer.
 
-##Events: 
+## Events: 
   there is different types of events - browser, mouse, keyboard, focus 
   events. It is a signal from related source that something has happened.
 
-##Event handlers: 
-  They are JavaScript code that are not added inside the <script> tags, but 
+## Event handlers: 
+  They are JavaScript code that are not added inside the `<script>` tags, but 
   rather, inside the html tags, that execute JavaScript when something 
   happens, such as pressing a button, moving your mouse over a link, submitting 
   a form etc.
   Example - `onClick` is an event handler:
+
   ```
     <button name="submit" onclick="validateForm(event)">
        Send your letter to Santa
@@ -23,30 +24,31 @@
   More on event handlers you can read here: 
   http://www.javascriptkit.com/javatutors/event1.shtml
 
-##Event.preventDefault:
+## Event.preventDefault:
   Prevents default behaviour of the events.
 
-##Refactoring:
+## Refactoring:
   is the process of restructuring existing computer code - changing the 
   factoring - without changing its external behavior. Refactoring improves 
   nonfunctional attributes of the software.
 
-##Objects: 
+## Objects: 
   stand-alone entities that have properties/type and functions
 
-##Constructors: 
+## Constructors: 
   function that creates and initializes an object.The 'new' operator is used 
   to create an instance of an object
 
-##Dot-notation: 
+## Dot-notation: 
   uses dot operator '.'  to access the properties of an object
 
-##Bracket-notation: 
-  uses the '[]' operator to access the properties of an object
+## Bracket-notation: 
+  uses the "`[]`" operator to access the properties of an object
 
-##Callback:
+## Callback:
   A function that we pass inside of another function as an argument
   Example:
+
   ```
   var a = ['a', 'b', 'c'];
   
@@ -55,33 +57,33 @@
   });
   ```
 
-##Local storage: 
+## Local storage: 
   function which allows the web pages to store information locally on to the 
   client's web browser using key-value notation
 
-##Serialize an object : 
+## Serialize an object : 
   converting an object to a string format. JSON.stringify() function is used 
   to serialize an object
 
-##Deserialize: 
+## Deserialize: 
   converting a string to an object. JSON.parse() function is used to deserialize 
   an object
 
-##JSON:
+## JSON:
   (JavaScript Object Notation) is a lightweight data-interchange format. It 
   is easy for humans to read and write. It is easy for machines to parse and 
   generate. It is a way to store information in an organized, easy-to-access manner.
 
-##Math:
+## Math:
   The JavaScript Math object allows you to perform mathematical tasks on numbers.
   It has properties and methods for mathematical constants and functions. 
   Pi number, calculate sin, cos, random etc.
 
-##AJAX:
+## AJAX:
   (Asynchronous JavaScript and XML) With it you can:
   - Update a web page without reloading the page
   - Request/receive data from a server - after the page has loaded
   - Send data to a server - in the background
 
-##Asynchronous JavaScript
+## Asynchronous JavaScript
   Use callbacks to run functions asynchronously.