Add Eiffel programming language definition.
Enable juxtaposed digit separators
Improve number handling for Eiffel.
Make simpler decimal number regex
Add g flag for Eiffel decimals
Add error message in red above the code if a file fails to download
Merge pull request #407 from Conaclos/gh-pages

Add Eiffel programming language definition.
Merge branch 'master' into prism-download
Eiffel should not be a default language + add credits
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