1277852 command line interface

@kbenne @Myoldmopar This is the Command Line Interface pull. Can one of you review? I've tested on Ubuntu, OS X, and Windows 7.
It's not as simple as just creating the symlink since the calls are all made from `build/src/EnergyPlus`. This is (perhaps?) a cleaner way to do it:
```
if(UNIX AND NOT APPLE)
  ADD_CUSTOM_COMMAND(TARGET energyplus POST_BUILD
  COMMAND ${CMAKE_COMMAND} -E create_symlink energyplus EnergyPlus
  COMMAND ${CMAKE_COMMAND} -E rename EnergyPlus "${CMAKE_BINARY_DIR}/Products/EnergyPlus"
  ) 
endif()
```

It's a little less cryptic than the bash approach.