Added include <algorithm>
Added type in std::min/std::max
Added include <math.h> and _USE_MATH_DEFINES if WIN32
Added Ubuntu documentation
Formatting README to Markdown format
Merge pull request #77 from davetcoleman/upmaster_readme_formatting

Formatting README to Markdown format. Thanks @davetcoleman!
Merge pull request #67 from larshg/libfreenect2mathfix

Added include <algorithm> in ifdef WIN32 and VS2013
replaced libusb_get_port_number with libusb_get_device_address to correctly identify devices, fixes #65
Merge pull request #80 from christiankerl/fix_device_identification

fix device identification
Added a libfreenect2_api export macro - to apply __declspec(dllexport) infront of all classes that is used from the library libfreenect2.

If they are not specified VS won't generate a .lib file and protonect will give linking errors.