For #51: Replace Joda lib with date4j
Fix crash
small fixes
For #51: fix crash for setCalendarDate and better handling of start day of week
mavenization, restructuring project into 'library' and 'demo' folders

If you want to build with maven you need to:
- locally install newest support library using
android-maven-sdk-deployer
- locally install date4j library jar
(or deploy them into some public repo like Maven Central)
deleting DS_Store
Merge pull request #52 from destil/replace-joda

Mavenization, restructuring project into 'library' and 'demo' folders, fix for #50
Update project structure for maven
Merge pull request #55 from roomorama/replace-joda

Replace joda lib with date4j and support Maven