Fix Unregister Bug & Add Functionality to Check Registered Type Converters#2

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jblacker wants to merge 4 commits intotoddfast:masterfrom

jblacker:master

Commits on Oct 26, 2018

Add ability to view currently registered type converters
Jordan Blacker
committed
Relocate (un)registration methods to keep overloads together
Jordan Blacker
committed
Fix bug in unregister method (Conversion<?> overload) where either a NPE is thrown, or conversions are not unregistered.
Jordan Blacker
committed
Update .gitignore for IntelliJ Users
Jordan Blacker
committed