Edit `BoundedNumericProperty.check` to use "%f" rather than "%d" for float max/min in ValueError error message.

If the supplied value is outside the bounds of BoundedNumericProperty, a ValueError is raised by `BoundedNumericProperty.check`.  However, the error message inside the ValueError is incorrect if the max or min are floats, since the error message uses "%d" rather than "%f".

This means for example that if the min is 0.6 and you supply a value of 0.4, the error message will tell you that your value was below the minimum bound of "0", which is incorrect for 2 reasons.
Made UrlRequest decoding optional with parameter
Clear version change documentation

The documentation of [RelativeLayout.py] (https://github.com/kivy/kivy/blob/master/kivy/uix/relativelayout.py#L21) says:

    .. versionchanged:: 1.7.0

        Prior to version 1.7.0 The :class:`RelativeLayout` was implemented as a
        :class`FloatLayout` inside a :class:`Scatter`.  This behaviour/widget has
        been renamed to `ScatterLayout`.  The :class:`RelativeLayout` now only
        supports relative position (and cant be roatated or scaled), so that the
        implemetation can be optimized and avoid the heavier calculations from
        :class:`Scatter` (e.g. inverse matrix, recaculating multiple properties,
        etc)

I was struggling why is it that it says it cannot be rotated or scaled?. I had a `Widget` that inherits from `RelativeLayout` in which I was able to `Rotate` and `Scale` without any problem. It took me quite a while to find out that the documentation only refers to multi-touch behaviour.
two minor typos
fixed slightly awkward grammar
linked gihub source code, missing full stop
English idiom, missing full stop
English idiom
typo, linked to wikipedia for event programming
typos
typos
typos, removed all full stops for consistency
extra space, like->such as
graphics: use destructor callback in ref() to avoid self.gc. ref #1270
Merge branch 'enhance-graphics-gc'
unicode fixes for py2(wip)
video widget loop problem fixed
PY2 fixes for TextInput, TextInput now maintains unicode internally.
closes #1271
core:text fix unicode handelingin `shorten` routine. closes #1274
uix:Bubble fix `arrow_pos` handeling when passed as a argument in init.
closes #1273