Documentation issues

[martin-g]

Hi,

At http://bootstraptour.com/api/ there is a table with all available settings.
Few of them have confusing default values for their types:

• backdropPadding has type Boolean|Object but its default value is 0, i.e. a Number
  Should the default be a false or the type Number|Object ?
• duration's type is Boolean|String and its default value is false but the docu says that the alternative value is in milliseconds. So maybe the type should be Boolean|Number ?
• Step delay/event #241 introduced delay option but it is not listed in the table

[sorich87]

Pull request? ;)

[martin-g]

I hope the improvements are correct :)

#329

[miksh7]

Same changes should be done in the step options.