Mulitple changes

  - Cchanged the vector names to capital letters.
  - Changed the file structure so it is easier to include the
    header file from the Arduino IDE and still keep the fork
    linked to the source.
  - I added several vector math functions to the header file
    to do scalar, addition, dot product and printing in a
    more generalized way.
  - The inteface is jumbled now between vector functions in the
    global space and those as static methods of LSM303.  This is
    a mess and NEEDS to be cleaned up before this library would
    be useful to anyone else.