Add menu proxies (taken from hildjj/macgap).
Menu proxies now working; added modifier key handling.
All to set modifier combinations from Javascript.
Add menu usage.
Merge branch 'user-agent' of https://github.com/jeff-h/macgap
Merge branch 'get-window-position' of https://github.com/jeff-h/macgap
Merge branch 'fonts' of https://github.com/jeff-h/macgap

Conflicts:
	MacGap.xcodeproj/project.pbxproj
	MacGap/Classes/WebViewDelegate.h
	MacGap/Classes/WebViewDelegate.m
Merge branch 'shell' of https://github.com/jeff-h/macgap

Conflicts:
	MacGap.xcodeproj/project.pbxproj
Merge branch 'master' of https://github.com/jeff-h/macgap

Conflicts:
	MacGap.xcodeproj/project.pbxproj