Merge pull request #10 from ilkerde/develop

Provide simple and complex acceptance test cases for YAML front matter.
Added YamlDotNet and a dynamic parsing extension to replace test implementation YamlFrontMatterParser
Updated Converter to use PageParser; YAML Front Matters are active now; Removed MenuBuilder
Fix for file export
MarkdownParser returns an empty result instead of an exception when no content is given; updated tests, added new test
Fixed symbols
Parse draft attribute
Added current page to template data, fixed pages collection for template data
Removed temporary console output