Create alluvial_ts.R

Examples for the time-series alluvial function alluvial_ts()
Create refugees.csv

Data for alluvial_ts() examples
Create alluvial_ts.R

Function to plot alluvial-style plots for simple time-series or equivalently formatted dat
Update alluvial_ts.R
Update alluvial_ts.R
Update alluvial_ts.R
Update alluvial_ts.R
Fixes in alluvial_ts

Fixed argument documentation:
1. When documenting more than one argument with @param args need to be
separated with a comma.
2. Percent symbols need to be escaped with backslash.

Added rudimentary example.

Dropped require() call. Is "grid" really required?
Roxygenizations
alluvial_ts is now exported
Moved refugees to data and capitalized the name
Documented Refugees
Added reshape2 to Suggests, used in examples
Reformatted Refugees so can be loaded with data()
Fixed alluvial_ts examples

Examples are run if reshape2 is available.
Load Refugees with data().
Docs of alluvial_ts use outsourced examples from

examples/alluvial_ts.R