Added delete function in Athlete class.
Redefined operators.

== and != redefined.
Qt'fied the profile selection.

Use Slots and Signals to handle the profile selection.
Code formatting.
MainWindow fixed.

Little code refactoring : "_deletePushup" changed to "deletePushup" .
Merge branch 'profile_deletion' of github.com:davcri/Push-up-app into profile_deletion