C++11 Fix / Remove Poco

Merge pull request #16 from twobitcircus/master

some notes

pivot now works

Merge pull request #15 from trojanfoe/game

Update example to use shared pointers.

Use shared pointers rather than raw pointers, for obvious reasons.

Remove .gitkeep.

Remove deprecations.

Avoid compiler warning.

Pivot should be floating point

Fix for getWidth() / getHeight() when rotated

Returning Correct image file path

Fix for ptr == NULL when assigning texture manually

Trim and Offset Fixes.