initial work for debug menu
Merge branch 'feature/debug-menu' of github.com:rstudio/rstudio into feature/debug-menu
change shortcut for setting a breakpoint; update the keyboard shortcut doc
use plain F10 for stepping (Shift-F10 is taken on Chrome for Windows)
don't show or enable breakpoint command for non-R file types
Revert "turn off automatic rpm dependency resolution"

This reverts commit 5fcc92687078e4c4d280ccc5919b746f6849065c.
update debug menu labels and icon
make the set breakpoint command visible at all times
check for null selected item in directory contents widget selection event
correct variable for cpack rpm dependencies
add 'clear all breakpoints' command and implementation
Merge pull request #41 from rstudio/feature/debug-menu

Add top-level debug menu and keyboard shortcuts
Merge remote-tracking branch 'origin/master' into feature/package-breakpoints

Conflicts:
	src/gwt/src/org/rstudio/studio/client/common/debugging/BreakpointManager.java
	src/gwt/src/org/rstudio/studio/client/workbench/views/source/editors/text/AceEditorWidget.java