Another missing comma
Updating GitHub contributors
fix superscript
Merge pull request #113 from physicsdude/develop

fix superscript
Merge pull request #115 from kargakis/ch02-fix

Add another missing comma
Update preface.asciidoc

bitcoin address clearer explanation
Update preface.asciidoc

I think it's better to explain the value and usage of a fee, instead of a more technical definition that identifies how it works.
It is possible for a transaction to be processed without a fee.
Update preface.asciidoc

Maintain consistency.  If you're gonna show an example bitcoin address, should show an example private key.  It also helps to understand it further when you can see an example.
Update preface.asciidoc

A clearer explanation of the value a wallet brings to a user
Update ch01.asciidoc

As I read through the history of Bitcoin section I kept asking when are you going to get to the part about Bitcoin.  I think half of that section is really events leading up to Bitcoin, as well Bitcoin didn't have any history until it was invented.
Update ch01.asciidoc

accidentally put What is Bitcoin, for History of Bitcoin
Update ch01.asciidoc

Identifying the potential pains that Bitcoin can solve, quantifying how big of an impact the innovation can really have.  This should hopefully get the reader excited about the possible power their code can have, and encourage them even more to learn more about Bitcoin.
Update ch01.asciidoc

I took the Coinbase description from their own about page.  They are not an exchange, since you do not exchange bitcoin with other users, you buy and sell it directly with Coinbase.  The big value they bring is making it easy to use bitcoin.
Update ch01.asciidoc

Using a bitcoin ATM is another method of getting bitcoins.
Update ch01.asciidoc

You can buy bitcoin using Purse.IO.
However I do not think it's a good idea to add purse.io to ways you can buy bitcoin because there is a chance that at any moment Amazon can shut them down and then the comment will become obsolete.
Update ch01.asciidoc

I personally use bitcoinwisdom all the time to watch/analyze prices over the exchanges
Update ch09.asciidoc

Minor changes/typos
Adding another comma following the changes from Issue #117
Merge branch 'erikwam-patch-15' into develop
Removing question marks from new titles