Added Division-ColorString functionality and trailing f for UIColor (32 bit only)

### Added Division-ColorString functionality

Added kOMColorHelperShowColorStringAsDivision to OMColorHelper. If it is set to 1 the color components are not shown as float numbers (.3f) but as (rounded component)/255.f

Example with kOMColorHelperShowColorStringAsDivision 0:
```objective-c
[UIColor colorWithRed:0.49f green:0.49f blue:0.49f alpha:0.00f];
```
Example with kOMColorHelperShowColorStringAsDivision 1:
```objective-c
[UIColor colorWithRed:125.f/255.f green:125.f/255.f blue:125.f/255.f alpha:0.00f];
````

### Added trailing f for UIColor-String

Because UIColor is only available on 32 bit architecture by now I added the trailing f (cast to float). See the two examples above.

### Limited alpha value to two decimal places

Because the ColorPicker-Interface only generates alpha values with two decimal places I removed the third unused decimal place.