Adding SlideGenerator stub.
Adding libopc files and modifying linker config to link against them.
Minimal PowerpointPackage data structure.
Adding code to create the minimal skeleton of a ppt file from a template.
Adding template pptx file.
Moving all dependencies to libopc to one facade class (1/2).
Moving all dependencies to libopc to one facade class (2/2).
Merge branch 'master' into SlideFactory
Adding slide class stub.
Merge branch 'master' into SlideFactory
Adding some comments and small refactor.
Restoring travis-ci build (1st try).
Restoring travis-ci build (2nd try).
Restoring travis-ci build (3nd try).
Merging master into SlideFactory
Merge branch 'master' into SlideFactory
Fixing plib.h for cross platform. (avoid configuration step)
Adding routine to add a slide to the presentation.
Renaming PresentationXml and Slide to PresentationPart and SlidePart.
Adding SlidePartBuilder.