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update php version, pin twig to lower version as major version increase causes composer install error. update composer

update php version in composer.json, change license to MIT, update project name, add dependency on phpunit 5.7 in dev

Drop use of term "books".

This will close #56

wordsmithing...

ref:
https://github.com/civicrm/civicrm-docs/issues/25#issuecomment-287789909

From what I can tell, every time a pull request is closed, GitHub
acutally sends *two* webhook requests, one for the pull request, and a
separate one with event = "push". This means that handling a closed
pull request event is unnecessary if we're already handling push
events.

- Don't send emails to "donotreply" addresses
- Handle a couple more error situations with specific exceptions

This is a temporary change, only until we can get #50 implemented

Book home pages

Conflicts:
	src/AppBundle/Resources/views/Read/book_list.html.twig
	src/AppBundle/Resources/views/Read/home.html.twig

Book categories

Custom theme

Refactor model