Update app version to 0.4.2

Builds/Linux/Makefile

Builds/Linux/Makefile.plugins

Builds/MacOSX/Info-App.plist

Builds/MacOSX/open-ephys.xcodeproj/project.pbxproj

Builds/VisualStudio2012/open-ephys.vcxproj

Builds/VisualStudio2012/resources.rc

Builds/VisualStudio2013/Plugins/Plugin_Debug32.props

Builds/VisualStudio2013/Plugins/Plugin_Debug64.props

Builds/VisualStudio2013/Plugins/Plugin_Release32.props

Builds/VisualStudio2013/Plugins/Plugin_Release64.props

Builds/VisualStudio2013/open-ephys.sln

Builds/VisualStudio2013/open-ephys.vcxproj

Builds/VisualStudio2013/resources.rc

JuceLibraryCode/JuceHeader.h

open-ephys.jucer