WaterField Designs has announced two new “Bumper-Fit”-sized cases for the iPhone 4. Company owner Gary Waterfield explains that due to the iPhone 4’s ongoing reception issues, the company wanted to create versions of its sleeve-like cases that could accomodate an iPhone 4 inside an Apple Bumper or any other similarly thin case. The Bumper Fit Smart Case is similar to the company’s prior iPhone 4 Smart Case, featuring a rigid…