Merge pull request #22 from jgmdev/premake

Added wx.feature function to use on configure.lua
No relevant changes: removed whitespaces, corrected author email and renamed wx/config.lua adding right header informations.
List too long. (...)
Reorganized files: rename setup.lua as init.lua, all wx.xxx vars here should only initialized, we set them all later using configure and later scripts, so move the real setup in setup.lua (for now setup.h manipulation). Make solution.lua more clear.
Minor changes: calling premake_gen.sh /help will show only premake options, --help will include also wx ones, use require instead dofile for solution.lua from main script.
Refactored wx.feature.