partial fix for issue #3
added some tests for old style string formatting for signed integer decimals
added some improvements to old string formatting of signed integer decimal types
added some tests for old string formatting of signed integer decimal
added some new tests for old style string format with signed integer decimal
Modifications for old style string format with signed integer decimal
removed commented code
Merge pull request #8 from kikocorreoso/master

PR to fix issue#3 (old style format with signed integer decimal)