Ported ToInvariantString() convenience methods from Deki into DReAM.
Ported IEnumerable<T> extension methods from Deki to DReAM.
Ported IDictionary<TKey, TValue> extension methods from Deki to DReAM.
Added DictionaryUtil.cs and EnumerableUtil.cs to project.
Merge pull request #75 from bjorg/2.4

Ported extension methods from Deki to DReAM.