Switch build system out to CMake.

Reorganized directories as part of this.
Delete the old qmake file
Add makefile which just calls cmake
Merge pull request #4 from umbrant/master

Markdown-ify the README
Merge pull request #5 from umbrant/cmake

Cmake
Added GL library to link targets
Improve error handling, avoid hardcoding paths
PDF works but the image wont scale when zoomed in.  Right now page pulling requests a page and scale, but that doesnt do anything.  Also bug with the last page flipping is fixed, but it still flips if more pages than the number of screens exist."
Merge pull request #6 from umbrant/error-handling

Improve error handling, avoid hardcoding paths
update readme to reflect the change to cmake
Segfault on compressed files fixed by making mangapages store shared_ptr to QImage instead of stupidly creating shared_ptr for stack QImages
Merge branch 'master' of github.com:mtao/MultiscreenManga