Proposed README updates
Add note to the README about the CLI interface for encryption/decryption
Make NamespaceSet always store namespaces as Strings to make checking for equality easier
Add a BooleanConversionFilter
Add an EnvironmentFilter
Add NamespaceFilter
Use the new Environmentable module in SystemEnvironment
Use the new filters in Settings
Delete now unused code from SystemEnvironment
Add a DecryptionFilter
Add the new DecryptionFilter to Settings
Always duplicate the settings hash before returning it so that we don't have inadvertent modifications
Fix documentation typo
Whitespace
Allow NamespaceSets to create themselves from a set of values
Use our new sweet square bracket NamespaceSet creation in the specs
Ensure a NamespaceSet can be created from another NamespaceSet
Allow NamespaceSets to be created from single values
Lazily process namespaces in a NamespaceSet so that we refrain from doing processing until we actually need to access the values
#to_a not #to_ary