Update .gitignore

Remove exception for NuGet
add multi theme function, ui still need to improve
add multi theme function, ui still need to improve
Merge branch 'hotfix' of https://github.com/comiscienceknight/MetroExplorer into hotfix
Merge branch 'hotfix'

Conflicts:
	MetroExplorer/MetroExplorer/PageExplorer.xaml