Port average_yield to pandas
Changed dividend accrual calculations over to pandas
Asset now completely dependent on pandas
Working on cleaning up pylint warnings

- Completely removed old csv loading. Now 100% pandas
Cleaning up todos
Fix more todos. Integrate fcalendar fully
Refactoring to add TargetPortfolio concept
Refactoring portfolio to be smaller and more dedicated
Pylint and TODO clean!
Fix assertion  error
Merge pull request #3 from EnsembleRCM/pandas

Port average_yield to pandas