Move NotNull and Nullable annotations to their own artifact
Initial annotation processor for NotNull and Nullable annotations
Error if an element is annotated with both NotNull and Nullable
Error if a void method is annotated with NotNull or Nullable
Check for NotNull and Nullable annotations on primitive types
Add check for erroneous overriding NotNull and Nullable annotations
Add warning for potentially incorrect NotNull or Nullable annotations on derived methods and parameters
Improved error reporting
Add note about potential future features
Limit the number of errors reported for a single method or parameter
Updated documentation for NotNull and Nullable
Merge pull request #434 from sharwell/annotations

Annotations
Fix error count limiting in NullUsageProcessor
Update several usages of @NotNull and @Nullable based on warnings from NullUsageProcessor
Fix test failure due to change error message text
Merge pull request #435 from sharwell/annotations

Annotations
Merge pull request #436 from sharwell/fix-test-output

Fix test failure due to change error message text