VS2013 compatibility

Avoid redefinition of log2 in recent _MSC_VER.
return NULL after failing to loadAudioFile on Windows.
VS2013 project files

Adding upgraded versions of standalone sample and TonicLib.vcxproj
change tab to spaces
Merge pull request #247 from xinaesthete/master

VS2013 compatibility
Wrote a test to ensure that multiplier output remains stereo when stereo generator is on the left, as well as on the right.
created bitcrusher
Removed a nonsensical comment
Fix project setting warnings and convert to XCTest
Cleanup projects for modern Xcode
Update novocaine
Cleanup demo project for iOS 7
Updating include guards for standards compliance. #244
Capitalize all header guards
Get rid of unnecessary null checks. #245
Fix warning in Novocaine
Fix implicit precision conversion warnings
[HOTFIX] fix project build settings for latest xcode