Added two sample MPO image files for testing.

Both MPO files represent 3D images and thus have a left image and a
right image. Both were taken with a Nintendo 3DS in Breakheart
Reservation in Saugus, MA.
Moved images to correct place.

Accidentally uploaded images to their initial test location, not the
proper location used by other tests.
First steps toward MPO support.

Allows Pillow to distinguish between JPEGs and MPOs, and provides some
MPO metadata handling. Does not yet handle multiple frames.
Activated MPO detection.

Added MPO to the list to be checked. Removed the superfluous second os
import. Added OS X & Komodo work files to .gitignore.
Further populated Exif values in TiffTags.

Added lots more of the possible Exif values per the EXIF specifications.
Workaround to test PyQt: https://github.com/travis-ci/travis-ci/issues/2219#issuecomment-41804942
More ImagePalette.py tests and remove unused and uncallable new()
Merge pull request #814 from hugovk/qt2.7

Test PyQt on Travis CI
Basic MPO reading works, seek is partially there.
Corrected offset for MPO frames.
Workaround to test PyQt: https://github.com/travis-ci/travis-ci/issues/2219#issuecomment-41804942
More detail when assert_image_similar fails
Storage, packing and access for HSV format images
Conversion between RGB and HSV images
Merge pull request #815 from hugovk/ImagePalette

More ImagePalette.py tests and remove unused and uncallable new()
Updated Changes.rst [ci skip]
Partial opacity text example, parameters on ImageDraw.Draw [ci skip]
Added support for encoding and decoding iTXt chunks.
Added iTXt tests.
Merge pull request #817 from wiredfool/draw_docs

ImageDraw doc update