CSHARP-629: add support for ToLowerInvariant and ToUpperInvariant in linq queries.

Author: craiggwilson

Driver/Linq/Translators/PredicateTranslator.cs

@@ -1208,14 +1208,8 @@ private IMongoQuery BuildStringQuery(MethodCallExpression methodCallExpression)
                 switch (stringMethodCallExpression.Method.Name)
                 {
                     case "ToLower":
-                        caseInsensitive = true;
-                        break;
                     case "ToLowerInvariant":
-                        caseInsensitive = true;
-                        break;
                     case "ToUpper":
-                        caseInsensitive = true;
-                        break;
                     case "ToUpperInvariant":
                         caseInsensitive = true;
                         break;

README.md

@@ -39,5 +39,6 @@ http://jira.mongodb.org/browse/CSHARP
 * Ed Rooth                  edward.rooth@wallstreetjapan.com
 * Testo                     test1@doramail.com   
 * Alex Brown                https://github.com/alexjamesbrown
+* staywellandy              https://github.com/staywellandy
 
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