Minor issue with column type separators

1) I have found that the MongoSerDe fails to process the column types string if the separators are not comma. I am working on the integration with HCatalog and while the original MongoSerDe works with Hive it fails when is being run under HCatalog. For some reason separators are changed from commas to colons. The fix is easy. Instead of using .split(",")  we can use .split("[,:;]") to handle all possible separators. 

2) Apache License 2.0