QML ObjectModel documentation improved
Install instructions updated
QML FileOperation added
Missing files added
Simplify the build system by changing the repository layout to
follow the recommended Qt module structure.

The Enginio library is now a proper Qt5 module so it can take
advantage of the convenience provided by the module system.
Fix linking of the QML plugin on mac.

Also change the module name to enginio and replace the io/engin plugin path
with Enginio.
Chunked file upload added
Merge build system changes from dev branch