fixing issues with custom sdoc options that extend the basic rdoc options
The --format option must come first to allow loading of the extra
options. Fixes #42 #53

Patch by @benfyvie, confirmed by @drbrain
See https://github.com/voloko/sdoc/pull/53#issuecomment-31902512
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Update json dependency
bump to 0.4.0 :heart:
Remove redundany < 5.0 from rdoc dependency specification
Merge pull request #61 from sferik/rdoc_dependency

Remove redundany < 5.0 from rdoc dependency specification
Remove code tags styling under pre elements

Since RDoc 4+ now wraps code blocks under a code tag, the style of the
code blocks is not backward compatible with the previous one.
Merge pull request #68 from robin850/master

Remove code tags styling under pre elements