* Return weekly contracts if no standard contracts exist
* Fix unit and regression tests
* Centralize default expiration type flags
* Add ExcludeWeeklys() method
* Mark IncludeWeeklys() as obsolete since weeklies are now default
* Fix CA1819 and CA1002 warnings
Changed the type of Languages statistic in regression tests from
Language[] to List<Language>. By doing that, the warning CA1819 was
removed but then the warning CA1002 was raised. However, this warning
was expected to be excluded from QuantConnect.Algorithm.CSharp.
* Improve implementation
* Simplify code
* Fix bugs
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* Add ShortButterflyCall and ShortButterflyPut strategies helper factory methods
* Reduce duplication by adding the base OptionStrategyFactoryMethodsBaseAlgorithm algorithm class
* Housekeeping
JosueNina