improve HtmlTable title parser to parse other types

[jakubwolny]

Current title parser return just "title" attribute:

convert: function(){
    return this.title;
}

But what if I have number or date type stored in attribute? There is no way to achieve sensible sorting.
My proposition:

• title should not be the "parser" because it does not parse anything.
• add "getter" parameter to sortable width default behavior:

return this.get('text')

As a parameter one could pass:

• function - which return proper value
• string - in this case function returning this attribute will be created

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[jakubwolny]

albo input-checked and input-value should not be "parsers" but "getters" because they get value from cell and do not care about format (date, number) so they cannot parse it.

[jakubwolny]

I have made a patch in #1042