separate completion list and help into separate popups
migrate to gwt 2.7.0
initial work on R tooltips
look on search path with .rs.getAnywhere
add in behaviour for hiding tooltip
Merge branch 'master' into feature/r-completion-signature-tooltip

Conflicts:
	src/gwt/src/org/rstudio/studio/client/workbench/views/console/shell/assist/RCompletionManager.java
tweaks to lookup
automatically pop up signature when inserting '(' for completion
Merge branch 'feature/r-autocompletion-popup' into feature/r-completion-signature-tooltip

Conflicts:
	src/gwt/src/org/rstudio/studio/client/workbench/views/console/shell/assist/CompletionPopupPanel.java
more styling
defer help popup to avoid noisiness in display
unloaded datasets will not be in namespace; tryCatch in lookup
remove popup placement hacks
better deferred help impl
provide file completions in '[...](|)' for markdown documents
use 'getS3method' to find s3 method
call massaging for evaluation in correct envir
special-case variants of read.table
add 'set working dir as project dir' button
ensure 'utils' available before check; wrapper for write.csv