Merge pull request #3 from kspeer/master

useR! 2013 Conference Slides
Fixed a bug where the labels did not always match the bars for non-grouped analysis. Thanks to Vasco for finding this.
Added an ordered parameter to the summary function.
Merge pull request #4 from kspeer/master

reverse.levels param added
Replaced cbind with merge to fix a bug where sometimes the values would not match up. Thanks to Vasco for reporting this bug.
Merge branch 'master' of https://github.com/jbryer/likert

Conflicts:
	R/likert.R
Fix for grouped analysis does not work for non-grouped.
group.order parameter can be used to specify the order of items in non-grouped analysis.
Fixed function call.
Convert factor to integer before calculating cross tabs.
Added a check to ensure all factors have the same number of levels.
Items (i.e columns) that are not a factor will be converted to a factor using as.factor.
Updated for recent changes.
Add levels to returned object.
Fixed problem with ordering of y-axis.
Added initial version of the shiny app.
Updated README
Update