A few usability improvements....

Two usability improvements

1. Added a build/ folder to hold IDE and build related artifacts. This avoids polluting the examples with IDE files.
    - currently contains an eclipse project that allows one to open up all the examples as an eclipse project
    -  additional IDEs can be added 
   
2. Added copyright headers for markdown (.md) files and shell scripts (.sh). The perl script still needs to be updated to be smart enough to automatically apply these headers when it sees files with these extensions.