Revert "(MODULES-5679) Add a new function ifelse to match ruby's tenary operator"

Author: david22swan

README.md

@@ -1179,15 +1179,6 @@ For example, `hash(['a',1,'b',2,'c',3])` returns {'a'=>1,'b'=>2,'c'=>3}.
 
 *Type*: rvalue.
 
-
-#### `ifelse`
-
-Shorthand version for if-else: this maps to the ruby tenary operator.
-
-For example, `ifelse(4 > 0, 'positive', 'negative')` returns `'positive'`.
-
-*Type*: rvalue.
-
 #### `intersection`
 
 Returns an array an intersection of two.