`-Wconversion` compliant floats

[Ashton Williams]

When using this wonderful plugin, code is generated like so:

[UIColor colorWithRed:0.065 green:0.576 blue:0.865 alpha:1.000];

This will cause warnings if -Wconversion is on:

error: implicit conversion loses floating-point precision: 'double' to 'CGFloat' (aka 'float') [-Werror,-Wconversion]

It can be fixed with a simple change:

[UIColor colorWithRed:0.065f green:0.576f blue:0.865f alpha:1.000f];

ColorSense should use the later format, with f type specifiers.