Eea.epub

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* Change: Switched to curl in the jenkins build install script
[olimpiurob refs 22402]
* Change: Changed fetch url for jenkins build install script to the install
script from the main EEA CPB repository
[olimpiurob refs 22402]
* Bug fix: Added a way to know if the ePub is being generated even if the
async worker is down or the queue is too busy.
[voineali refs 23411]

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* Bug fix: Fixed validation errors for exported ePubs (epubchecker)
[avoinea]

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* Upgrade step:
I. Within "Plone > Site setup > Add-ons" install "EEA Converter"
II. Within **Plone > Site setup > Content Rules**:
1. Filter by **Async PDF Export (fail)** and **Async PDF Export (success)**
2. Disable founded rules
3. Filter by **Async Export (fail)** and **Async Export (success)**
4. Update these rules **email texts** with previous disabled ones (PDF ones) by changing **PDF** with **${download_type}**
5. Delete **Async PDF Export (fail)** and **Async PDF Export (success)** related rules
[voineali refs 22971]
* Feature: Added possibility to download documents as ePub asynchronously
[voineali refs 22971]
* Bug fix: fixed UnicodeDecodeError within download.epub template
[voineali refs 23338]

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* Feature: Added possibility to add a fallback ePub file within context called
**action-download-epub** in order to temporarily stop dynamic ePub
generation and statically return this item.
[voineali refs 22970]

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* Feature: Added "Download as ePub" action also within export_actions category
[voineali refs 22686]

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* Change: Made epub.support/can_download accessible from URL
[voineali refs 20846]