WASHINGTON (Reuters) - The International Monetary Fund on Thursday approved a 28 billion euro ($36.7 billion) bailout for Greece and warned Athens there was no room for missteps in implementing the economic program. The IMF said it would immediately disburse 1.65 billion euros to the Greek government, part of a broader 130 billion euro international rescue package to keep Greece funded through 2014 and avoid a messy debt default. The IMF board approval ends months of financial uncertainty for Greece. ...