added toFixed and stubbed toPrecision, added test coverage.
Merge pull request #18 from eborden/NumericToMethods

added toFixed and stubbed toPrecision, added test coverage.
added integer test
Merge pull request #19 from davidstanley01/dev

added integer test
implemented base handler class
hack not needed since phpunit autoloads
skeleton in place for PHP RFC
rename to txt format
remove markdown version