Merge pull request #28 from borc/master

Allow empty internal value if options.allowBlank is true
New version 2.1.2
added bower.json for bower support
Added spanish translation
Merge pull request #29 from josecols/master

Added spanish translation
update bower.json
update doc
new version 2.1.3

Added es i18n
Update doc
Update bower.json
fix bug for firefox
new version 2.1.4

Fix bug with setOptions({value:'2011/12/11 12:00'})
new version 2.1.5

Added th - Thai i18n
Added options yearOffset for Buddhist era
Fix CSS bug
Add 'empty' command for clearing the picker value externally
Merge branch 'master' of https://github.com/xdan/datetimepicker