Adds type conversion for the radius value in _blur_regions function

[DiegoSanchezE]

Environment:
OS: Windows 10
Browser: Chrome
Version: 70.0.3538.102 (Official Build) (64-bit)
Robot Framework: 3.0.4
Python: 3.7.0

Changes and Additions:

• Adds type conversion to float for the radius value in _blur_regions function. See issue description below.
• Updates gitignore: ignores IDE config files.

Issue:
This is how I'm declaring the radius scalar variable in my Robot Framework test case:

*** Variables ***
@{blur}         ${LOGIN_PASSWORD_INPUT}    ${LOGIN_BUTTON}
${tolerance}    0.05
${radius}       0.9

However, I was seeing the following error when using the radius argument in the capture full screen keyword:

TypeError: must be real number, not str

I narrowed down the issue to the __init__.py file, line 298, in the _blur_regions function:

blurred_image = cropped_image.filter(ImageFilter.GaussianBlur(radius=radius))

The code is expecting a float, but is interpreting (for some reason) that the argument is a string. (perhaps a Robot Framework limitation?)

Fix:
I implemented type convertion from string to float to that argument:

blurred_image = cropped_image.filter(ImageFilter.GaussianBlur(radius=float(radius)))

Testing:

• Run the Example test case (see ReadMe file) in test mode and play around with the radius value.

Expected result:

• The radius value should be reflected in the screenshots.
• Nothing should break regardless of entering a string or int numerical value (alphabetical values will obviously fail).