Issue #49 New refactoring - convert line and block comments to javadocs
Issue #50 New refactoring - remove empty comments
Issue #52 New refactoring - convert javadocs to block comments

Convert block and line comments to javadocs.
Removed Eclipse generated "TODO Auto-generated catch block".
Preliminary support for converting javadocs to block comments.

ASTCommentRewriter.java, Refactorings.java, AutoRefactorHandler.java:
Added support for converting to javadocs.

RemoveEmptyCommentsRefactoring.java:
See general changelog.

RemoveEmptyCommentsSample.java:
Added more samples.