spruced it up

You were miss a doctype so I add that

next I added bootstrap (via cdn) to make styling things a bit easier, then I cleaned up the css that was now redundant (due to bootstrap)

I also changed the part where you get the input value so that it gets converted to a number. this way you'll be dealing with the number 10 instead of the string "10". Because of this type coercion is no longer need on line 121 of btcprice.js (!= does type coercion, !== does not)

also, 
![semicolons everywhere](http://i.imgur.com/8WCwwD2.jpg)

in other word I filled in missing semicolons

pic below is how the page looks with my changes

![image](https://cloud.githubusercontent.com/assets/1839428/5335119/0faffa20-7e71-11e4-8ef5-f2a4036463ed.png)