Remove using directives

In C++11, 'function' is ambiguous (can be std:: and std::tr1::).
And it is bad style anyway ...
Update README.md
Update LICENSE
Merge pull request #2 from mgeier/remove_using

Remove using directive from RazorAHRS.h
Added ability to read direct sensor data to Android library
Updated Readme
Arduino 1.x and Processing 2.x compatibility update
v1.4.2 header and readme updates