Add alias for drush commands

It's a pitty!
'csex' command was our favorite command in the team and it helped us not to die from the depression.

updating the issue summary for all the added commands

I find "ceespex" and "ceespim" easy to say and close enough to the former ones for memorization. Rest then following the pattern:

1. cspex
2. cspim
3. cspac
4. cspde
5. cspso

How about first character from config split and next 2 from command?

1. csex
2. csim
3. csac
4. csde
5. csso