Add indexing operations
Merge pull request #48 from Fuco1/index-operations

Add indexing operations
Release 2.1.0
Fix switched around doc strings for -find-index/indices
Provide an implementation of function composition.
Updates the documentation.
Merge pull request #50 from kurisuwhyte/master

Provides `-compose` for function composition
Add Christina Whyte (@kurisuwhyte) to list of contributors
Release 2.2.0