v0.7.0

• The keyword columns_width can be used to select the desired width for each column.
• Add the possibility to automatically wrap the table cells when using the text back-end and the column size is fixed. This can be triggered by the keyword autowrap. (Issue #21)
• Initial version of HTML back-end. Notice that this is the first version with a minimal set of features. This implementation should be considered beta.
• The character " is not escaped anymore when printing cells of type AbstractString. (Issue #22)
• When using the text back-end, passing the table format as an option to pretty_table function is now deprecated. The table format in all back-ends must be passed using the keyword tf. Thus, for example, pretty_table(data, unicode_rounded) must be converted to pretty_table(data, tf = unicode_rounded).