all upper world files
Extend world files support to upcase basenames.
Merge pull request #1 from bjlittle/tfw_up_up

Extend world files support to upcase basenames.
Review actions.
Merge pull request #2 from bjlittle/tfw_up_up

Review actions.
Merge pull request #378 from bblay/tfw_up

Adds upper case world file support.