Update README features section
Removed uneeded files
Remove not used files
Add crypt get_gpg method
Return GPG instance from get_gpg
Update requirements
Refactor
Add touch function into utils module
Add list credential
Test get credential
Refactor test list credential
Redesign db to use classes
Remove unused crypt module
Refactor test
Rename mock_gpg to create_gpg in tests
Remove duplicate version in setup
Support python2
Update README
Refactor tests
Redesign credential as a class