Add newlines to error message for clarity

[hugovk]

Also remove a space and lowercase "version" for sentence case.

Before:

/Users/hugo/github/Pillow/PIL/Image.py:77: RuntimeWarning: The _imaging extension was built for another version of Pillow or PIL: Core Version: 4.3.0.dev0Pillow Version:  4.2.0
  warnings.warn(str(v), RuntimeWarning)
Traceback (most recent call last):
  File "/tmp/Downloads/2639.py", line 1, in <module>
    from PIL import Image, ImageDraw, ImageFont
  File "/Users/hugo/github/Pillow/PIL/Image.py", line 62, in <module>
    PILLOW_VERSION))
ImportError: The _imaging extension was built for another version of Pillow or PIL: Core Version: 4.3.0.dev0Pillow Version:  4.2.0

After:

/Users/hugo/github/Pillow/PIL/Image.py:78: RuntimeWarning: The _imaging extension was built for another version of Pillow or PIL:
Core version: 4.3.0.dev0
Pillow version: 4.2.0
  warnings.warn(str(v), RuntimeWarning)
Traceback (most recent call last):
  File "/tmp/Downloads/2639.py", line 1, in <module>
    from PIL import Image, ImageDraw, ImageFont
  File "/Users/hugo/github/Pillow/PIL/Image.py", line 63, in <module>
    PILLOW_VERSION))
ImportError: The _imaging extension was built for another version of Pillow or PIL:
Core version: 4.3.0.dev0
Pillow version: 4.2.0