Add convenience function for conversion to ipm

Change-Id: I2b9138322558fc1a2da2f9877cefe3d2268d2412
diff --git a/NAMESPACE b/NAMESPACE
index 4c3ff8f..bb3fd5f 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -7,7 +7,9 @@
 export(ci)
 export(complete)
 export(expand_grid)
+export(geom_freq_by_year_ci)
 export(group_by)
+export(ipm)
 export(mutate)
 export(select)
 export(summarise)
@@ -31,6 +33,7 @@
 import(methods)
 import(utils)
 importFrom(broom,tidy)
+importFrom(dplyr,.data)
 importFrom(dplyr,bind_cols)
 importFrom(dplyr,bind_rows)
 importFrom(dplyr,enquo)