First round of edits for section 1

I've been reading over/making edits to the first section over the past few days. My edits are still very rough and need at least one more run through. Not to mention I that I need to take a look at section two. So far though it is great. Lets talk IRL tomorrow! Most of my edits involved the following:

- Pronoun consistency. I strongly advocate the use of "we" and "our" over "you" and "your" in programming texts. It feels collaborative, active and engaging, and pleasantly non-directive. You seemed to fluctuate pretty evenly between the two but I recommend the second-person plural approach :).
- Grammar and spelling (I no doubt missed some as well).
- Sentence clarity. I did some rewording here an there.
- Consistency with `functionName` vs `functionName()`. I know that this is tricky, lets talk tomorrow.
- Clarity around a function vs a class's property

There were a few edits regarding tone and simplicity as well. I think that this is a strong chapter overall and your example sketches are __fantastic!__. You do a nice job of covering some semi-advanced material in a non-scary fashion. This chapter will be approachable to beginners but offer some niceties to more advanced oF users as well.