Add properties to the book model

[bdr99]

These properties are for use on the search results page. The author property is parsed from the YAML using PyYAML. The title_short and description_short properties are generated dynamically.

[bdr99]

After some investigation, we determined that the CSS approach to truncating text is only possible for single line text. Since we require multiple lines to be displayed, we will have to stay with the server-side truncation.

[eshellman]

for multiline blocks you can use overflow: scroll;

[bdr99]

@eshellman We're not too sure if that would look better. Do you think scroll bars are the best way to truncate descriptions?

[eshellman]

maybe looks better on the mac; if you fix the width the bottom scroll goes away.

[bdr99]

@eshellman I have made this change as part of #58.

[eshellman]

what's with the travis build failing?

[bdr99]

@eshellman I'm not sure why it's failing, it seems that for some reason it can't find the .travis.yml file. It's strange because the PR that added that has been merged into master.

[eshellman]

should have realized that a pull from master was needed