Refs #8 - Introduced support of INI files as input for POST requests. Introduced 'context extractors'.
Refs #8 - Moved context extractors from views to a contextextractors module.
Refs #8 - On POST requests, mapped text/plain to INI-style (configparser) context extraction.
Refs #8 - Added examples about posting data.
Merge pull request #9 from novagile/8-post-ini

Closes #8 - Introduced support of INI files as input for POST requests