Generalized a few .gitignore rules
Add a case for parsing JSON dates
Cleanup
Replace DateTime with DateTimeOffset in Jsval
Version changed to 0.5.3
Improve JSON parsing

Summary merge: 'beta-fixes'

* Version changed to 0.5.3
* Replace DateTime with DateTimeOffset in Jsval
* Cleanup
* Add a case for parsing JSON dates
* Generalized a few .gitignore rules