don't create monitor directories during startup
put next button on far left of debug toolbar
tweak build.xml comments
Merge pull request #33 from rstudio/bugs/callstack

fix some debug problems found by the RStudio team
only hide the console interrupt button when a new prompt occurs
reduce gwt permutations by eliminating all browsers but safari and gecko1_8 and using collapse-property
introduce desktop-draft mode
specify -noprecompile for faster devmode startup
add support for sourcemaps (chrome) and emulated stacks (other browsers in server mode)
pass full stack trace for client exceptions and include method names in the log
enable raise exception diagnostic commands
basic infrastructure for server side symbol maps
initial work on symbol maps
eliminate -noprecompile
fix miscelleneous debugging issues

- Source references won't be followed if empty (JJ)
- Language objects now display correctly (Hadley)
- R/non-user code in the callstack is now visible if it is executed by user code (Hadley)
- Console now takes focus when using the debug command toolbar (JJ)

Merge remote-tracking branch 'origin/bugs/callstack'

Conflicts:
	src/gwt/src/org/rstudio/studio/client/workbench/views/console/ConsolePane.java
resymbolize using symbols maps
don't record line numbers in emulated stack mode (doubles the size of the payload)
always use native stack mode
improved formatting for log messages
load symbol map when priming the cache