Merge remote-tracking branch 'upstream/master'
Add happitails lab files.
Merge remote-tracking branch 'upstream/master'
Create files for investment homework.
Added Client and Portfolio classes, reorganized files.
Add Management class and start list_clients method.
Complete list contacts method.
Finish add client method.
Add stock check method.
Opening salvo for buying stock and adding to portfolio methods.
More work on buy stock, portfolio creation and balance checking methods.
Revise create portfolio and buy stock methods, add confirm methods for client and portfolio type.
Add additional initial data, complete methods.
Fixes.
Confirm working list client, add client, buy stock, check stock and quit function.
Add sell stock functionality.
Debugged.
Fix in buy stock method to return to menu when done.
Merge pull request #58 from jasonklein/master

Investments portfolio homework