Fixed cppcheck unusedFunction option

According to the cppcheck manual (http://cppcheck.sourceforge.net/manual.pdf), the correct name of the check is 'unusedFunction' (singular) instead of 'unusedFunctions'.
Update find vrjuggler 3.0 to work more reliably
Update help.
Fix FindVRJuggler for newer cmake versions
Skip calibration.table - not used
Fix CreateLaunchers to support forward-compatible VC versions
Fix VR Juggler base path determination.
Make launchers on *nix executable
added support for wdk8 in WinHID
Merge pull request #16 from lpberg/winhid-wdk8

added support for wdk8 in WinHID
Merge pull request #15 from freitass/patch-1

Fixed cppcheck unusedFunction option
Find DirectX XInput library
Improve windows SDK finding.
Fix up OpenHaptics nested targets.
Add FindInterSense.cmake
Update help files.
Fix syntax error in BoostTestTargets.cmake
make GetGitRevisionDescription.cmake aware of submodules
Merge pull request #18 from PiQuer/master

make GetGitRevisionDescription.cmake aware of submodules
that have a .git file instead of a .git directory.
Merge pull request #17 from gunnarbeutner/patch-1

Fix syntax error in BoostTestTargets.cmake