use simpler naming in Action1, Func1 because is used as a default for IDEs when generating implementing methods

Author: davidmoten

src/main/java/rx/functions/Action1.java

@@ -18,6 +18,6 @@
 /**
  * A one-argument action.
  */
-public interface Action1<T1> extends Action {
-    void call(T1 t1);
+public interface Action1<T> extends Action {
+    void call(T t);
 }

src/main/java/rx/functions/Func1.java

@@ -18,6 +18,6 @@
 /**
  * Represents a function with one argument.
  */
-public interface Func1<T1, R> extends Function {
-    R call(T1 t1);
+public interface Func1<T, R> extends Function {
+    R call(T t);
 }