Cache NPE instance since exception creation is expensive.
Fix lint issues with javadoc.
Ignore future changes to gradle.properties.
Update version for next release.
Switch to factory functions for exceptions in Checks.
Add copyright preamble to Exceptions.
Add BigDecimals utility functions and literals.
Add copyright preamble to BigDecimalsTest.
Add Longs conversion functions.
Reorder methods.
Add toLongOrNull to Longs.
Add Objects with null checks and predicates.
Add flatten to Options.
Add typed overloads of alwaysTrue and alwaysFalse.
Add chain functions to UnaryFunctions.
Add more conversion methods to BigIntegers.
Add remaining conversion methods for numeric types.
Add Objects.toStringValue mapper.
Add type parameterisable toStringValue and remove concrete implementations.
Update README.