Merge pull request #1 from gosexy/master

Updating fork with changes from original
Adds tests and fix for GPS coordinate retrival

Adds 2 tests for getting longitude and latitude.
Fixes tag name retrival in file main_c.c in method import_entry by using
exif_tag_get_title_in_ifd instead of deprecated method
exif_tag_get_title.
Usage of deprecated method leads to wrong tag name because of
overlapping in tag definition in libexif.
Reduces size of image file for GPS location test
Fixes retrival of 'Latitude' tag and adds tests. Thanks @oliverwelter.
Merge branch 'oliverwelter-master'