Add math environments support

• Add support for math environments
• continious integration
• improved documentation

Fix critical bugs

Fix critical bugs

• handling of TITLE was broken
• in newer version of org mode > 9.0 handling of EPUBSTYLE was broken, preventing anything useful from happening
• several typos fixed

Thanks to @rjekker for working with me on this.

Fix minor issues

This release fixes two minor issues

• the stylesheet now no longer prefixes code blocks with the language name
• there was an issue with filename expansion during generation of the epub

Fix issue with xhtml output

Fix an issue where ox-epub would not generate valid xhtml. This should silence epbucheck.

Adapt to ox conventions

This release adapts the exporter to be more in line with ox conventions.

This also adds image export and css inclusion.

First renamed release

First release after the rename to ex-epub from org-epub

final 0.1 release

This release should have all errors that came up in the MELPA inclusion process fixed.