Some miscellaneous kotlinpoet updates (#786)

* KotlinPoet 1.0.1

* Nix asNullableIf in favor of plain copy() function use

* Add a test for packages that look like classes

Resolves #783

kotlin/codegen/pom.xml

@@ -25,7 +25,7 @@
     <dependency>
       <groupId>com.squareup</groupId>
       <artifactId>kotlinpoet</artifactId>
-      <version>1.0.0</version>
+      <version>1.0.1</version>
     </dependency>
     <dependency>
       <groupId>com.google.auto</groupId>