Fully working content provider

There is 1 content provider with multiple URI's for the CRUD of
different tables in the database
Merge pull request #2 from KB50-G1/develop

Fully working contentprovider
Fully working contentprovider
Delete CompanyProvider.java
Delete DatabaseHelper.java
Delete OfficeProvider.java
Delete Provider.java
Merge pull request #3 from KB50-G1/feature_sqlite

Feature sqlite