updated gems
started a few more chapters and added placeholders for a few chapters
minor updates to quick start chapter
Leanpub says some images is too wide

We found the following problems with your images:

- The image images/installation/windows/desktop.png is too wide to fit
on your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/windows.md

- The image images/installation/windows/internet_explorer.png is too
wide to fit on your page. We have made it a bit narrower for you. You
don't need to take any action. This image is used in these file:
installation/windows.md

- The image images/installation/windows/firefox.png is too wide to fit
on your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/windows.md

- The image images/installation/windows/chrome.png is too wide to fit
on your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/windows.md

- The image images/installation/windows/chromium.png is too wide to fit
on your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/windows.md

- The image images/installation/windows/opera.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/windows.md

- The image images/installation/mac/desktop.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file: installation/mac.md

- The image images/installation/mac/safari.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file: installation/mac.md

- The image images/installation/mac/firefox.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file: installation/mac.md

- The image images/installation/mac/chrome.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file: installation/mac.md

- The image images/installation/mac/chromium.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file: installation/mac.md

- The image images/installation/mac/opera.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file: installation/mac.md

- The image images/installation/ubuntu/desktop.png is too wide to fit
on your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/ubuntu.md

- The image images/installation/ubuntu/firefox.png is too wide to fit
on your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/ubuntu.md

- The image images/installation/ubuntu/chrome.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/ubuntu.md and installation/ubuntu.md

- The image images/installation/ubuntu/opera.png is too wide to fit on
your page. We have made it a bit narrower for you. You don't need to
take any action. This image is used in these file:
installation/ubuntu.md
fixed code formatting

Leanpub complained:

- We had to add line-wraps to some code shown below:
$ export SELENIUM_SERVER_JAR=

/usr/local/opt/selenium-server-standalone/selenium-server-standalone-2.3
7.0.jar
another code formatting fix

Leanpub says:

- We had to add line-wraps to some code shown below:
> browser["gbqfq"]
=> #<Selenium::WebDriver::Element:0x6faea7c65902853c
id="{fca96529-8bc6-bf4f-8e78-376f037c351a}">