Merge pull request #130 from JohannesMoersch/ResultCollectionPartition

add `Partition` extension method for collections of `Result<TSuccess, TFailure>`

Merge pull request #127 from JohannesMoersch/AddPartialResultsAndOptions

Add partial results and options

Merge pull request #126 from JohannesMoersch/FullySupportNullable

Fully support nullable

Merge pull request #125 from JohannesMoersch/DoOnFailure

add `DoOnNone` extension method to `Option<TValue>`; add `DoOnFailure` extension method to `Result<TSuccess, TFailure>`

Merge pull request #123 from JohannesMoersch/AddNullableSupport

Add nullable support

Merge pull request #120 from JohannesMoersch/ResultOfOptionApply

Result<Option<T>, TFailure>.Apply

Merge pull request #119 from JohannesMoersch/WhereOnSome

WhereOnSome for Result<Option<TSuccess>, TFailure> types

Merge pull request #116 from JohannesMoersch/OptionOfStringExtensions

Convenience extension methods for Option<string>

Merge pull request #114 from JohannesMoersch/ApplyWithIndex

Add overloads of collection extension methods Apply and Do accepting index

Merge pull request #111 from raukodraug/TraverseForEnumerableOption

Traverse for enumerable option