Support inline code

[mpastell]

Started working on this, there are several required changes:

• Parse inline code
• Run inline code
• Format output
• Implement caching
• Fix convert_doc
• Add tests and
• Add documentation

[coveralls]

Coverage decreased (-12.0%) to 71.681% when pulling 9dc99ba on inline_chunks into 3da8865 on master.

[coveralls]

Coverage decreased (-4.3%) to 79.333% when pulling c791824 on inline_chunks into 3da8865 on master.

[coveralls]

Coverage decreased (-0.2%) to 83.439% when pulling b61a2a0 on inline_chunks into 3da8865 on master.

[coveralls]

Coverage increased (+0.7%) to 84.349% when pulling 2715baa on inline_chunks into 3da8865 on master.

[coveralls]

Coverage increased (+0.7%) to 84.349% when pulling 9a1d655 on inline_chunks into 3da8865 on master.