Add new JDBC4 methods
LogStatement: update methods and class javadoc
LogPreparedStatement: update methods and javadoc.
LogDataSource: update javadoc and statements
LogConnection: update statement and class javadoc
LogCallableStatement: update TODO methods.
LogCallableStatement: Map -> Map<Object, Object>
Map -> Map<Integer, String>
add gitignore file
javadoc: 1.4 -> 1.6