* Fixed clipping bug when USE_WX_ZOOM is enabled that causes rats nest
  to be drawn incorrectly.
* Fix ambiguous function error in trigo.cpp when building with MSVS.
* Add instructions for building wxWidgets with graphics context
  enabled (GDI+) using MinGW/MSYS to COMPILING.txt.
* Initial EESchema find dialog work.
* Set modified flag when using PCBNew global deletion dialog to prevent
  closing without warning user of changes.

Big cleanup of sourcetree root structure, added Documentation subfolder, moved packaging stuff for osx and windows (nsis) to packaging.