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Merges #59

• Fixes #54 (broken customizations)
• Adds the jingo version to the meta generator
• Better README
• Fixes a potential crash
• Adds missing page titles (regression bug)

• Adds support for the GitHub logins
• Adds support to be able to serve images and other assets from the repo

The markdown module we use (Marked) tries to overcome some "obscure" problems with the original Perl markdown parser by default. These produces some problems when rendering HTML embedded in a markdown document see also issue https://github.com/claudioc/jingo/issues/48. By default we now want to use the original parser and not the modified one (pedantic: true).

There is a new option to override this behaviour (application.pedanticMarkdown).