last sync and sync period in Category and DataProvider models
Merge pull request #5 from Harunx9/master

last sync and sync period in Category and DataProvider models
Managers delete method fix after tests
project clean
Merge pull request #6 from Harunx9/master

Managers delete method fix after tests
Merge branch 'master' of https://github.com/Siemienik/Rss-Atom-Reader