Support processing without outputs
Added simplecov
Updated Readme
Oops, it should properly work without outputs now..
Small fixes
MissingHeaderException for JSONOutput, ScreenOutput and YAMLOutput
Updated Parser and Document tests
Updated example filename
Output write_row exception

Raises NotImplementedError
Output fixes (row count)
Updated tests
Revert row count fixes and updated HTML output
Use the correct row count
Updated tests
Added output tests