Raise RequestError if form fails to validate.
OB-41: Validate page size parameters if book size is custom
Don't print the response too early.
OB-49: replaced booki/flossmanuals references to booktype
OB-40: Squashing some epub validation errors

Added the missing 'head' node. Fixed wrong mime type.
OB-40: Fixed generating TOC/navigation for EPUB output.
OB-50: Fixed server parameter validation when wildcards are used in configuration.
OB-37: Fixed EPUB metadata generation
OB-51: Fixed templated HTML generation.
OB-52: Fixed NCX creation with int. chars in book title.
OB-53: Split espri script to implementation module and CGI interface
OB-53: Added Espri view and task
BTPRO-32: Removed links to obsolete js libs
BK-393: Synced licenses with Booktype

Added licenses that were missing, changed abbreviations
that were different in Booktype.
BK-393: Added the CC0 license
Removed obsolete server definitions.
OB-56: Fixed parsing of boolean values
Merge branch 'devel' into bookjs

Conflicts:
	lib/objavi/classic/tasks.py
	lib/objavi/fmbook.py