Merge pull request #17 from hsyed/slick1

merged into Slick1, thanks
fix concurrent problem of PGObjectTokenizer
Update README.md
fix bug #19 - Bug in joda: Value 0 for monthOfYear must be in the range [1,12]
refactoring PGObjectTokenizer
minor refactor PGObjectTokenizer.PGTokens
minor refactor PGObjectTokenizer.PGTokens
Merge pull request #1 from tminglei/slick1

Slick1