Merge pull request #348 from r4d2/master

R: Fixed for loop syntax and added while

UltiSnips/r.snippets

@@ -48,7 +48,7 @@ while(${1}) {
 endsnippet
 
 snippet for "for loop"
-for ({${1:item} in ${2:list}) {
+for (${1:item} in ${2:list}) {
 	${3}
 }
 endsnippet

snippets/r.snippets

@@ -23,6 +23,16 @@ snippet ei
 		${0}
 	}
 
+# loops
+snippet wh
+while(${1}) {
+	${2}
+}
+snippet for
+for (${1:item} in ${2:list}) {
+	${3}
+}
+
 # functions
 snippet fun
 	${1:name} = function (${2:variables}) {