TableView v0.7.1

Diff since v0.7.0

Closed issues:

• Show column types (#49)
• failed to build TableView beacause of error 500 (#53)
• showtable can't be downloaded as markdown for the WebIO not detected (#56)

Merged pull requests:

• Update docstring so list displays properly (#79) (@pdeffebach)
• add default is_javascript_safe() function (#82) (@baumgold)