Changed tabs to spaces in various files
Merge pull request #540 from tomgalvin594/convert_tabs

Changed tabs to spaces in various files
Adds name, vendor ID and product ID for joysticks.

- Implemented on Windows, Mac OS and Linux.
- Adds sf::Joystick::Identification structure to hold
  name, vendor ID and product ID.
Merge pull request #528 from NoobsArePeople2/joystick

Adds name, manufacturer ID and product ID for joysticks.
Added CMake find module for udev library
Image::flipVertically(), Image::flipHorizontally() optimizations.
Minor improvements in sf::Window and sf::RenderWindow documentation
Minor improvements in sf::Ftp documentation
Optimized sf::Listener with a cache

Two optimizations:
- Get functions return locally stored value
- Set functions call OpenAL only if value has changed
Exposed up vector in sf::Listener API

Closes #545
Output error message in SoundStream when bits are zero

Fixes #529
Made Ftp::sendCommand() public
Minor formatting
Improved Ftp::sendCommand() documentation
Fixed several Doxygen warnings, limited input to *.hpp files
Cached sf::Text attributes

Two optimizations:
- If a value remains the same, nothing happens
- Recompute geometry only before drawing and bound access, not after each set

Closes #413
Fix typos and missing Joystick::
Merge pull request #555 from varnie/master

Image::flipVertically(), Image::flipHorizontally() optimizations
Window::create() now also resets framerate limit

Fixes #371
Merge pull request #562 from CheezeCake/master

Fixed compile errors on FreeBSD