Implements equals method

[quaff]

Fix https://github.com/opentracing-contrib/java-jdbc/issues/83

[coveralls]

Pull Request Test Coverage Report for Build 311

• 0 of 43 (0.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.06%) to 48.236%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/io/opentracing/contrib/jdbc/TracingDataSource.java	0	7	0.0%
src/main/java/io/opentracing/contrib/jdbc/TracingCallableStatement.java	0	9	0.0%
src/main/java/io/opentracing/contrib/jdbc/TracingConnection.java	0	9	0.0%
src/main/java/io/opentracing/contrib/jdbc/TracingPreparedStatement.java	0	9	0.0%
src/main/java/io/opentracing/contrib/jdbc/TracingStatement.java	0	9	0.0%
<!--	Total:	0	43	0.0%	-->

Totals
Change from base Build 310:	-2.06%
Covered Lines:	506
Relevant Lines:	1049

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💛 - Coveralls

[quaff]

As this doesn't use the trick mentioned in #83 to get through the WrapperProxy/Proxy objects, can you explain how this fixes the problem? Did you test with debugging output and ever get a 'true' result (where the WrapperProxy is used)? No tested, you should provide a minimal test case.

[quaff]

@randallt WrapperProxy added, but I think It should be done by WrapperProxy self.

[quaff]

@randallt Could you provide a test case?