Fixed bug #203.

2. change \t \b \n \r \f to \\t \\b \\n \\r \\f in nextQuotedValueForString method

The nextString method in JsonReader class return a non quote value, some special character e.g. ‘, ” ,\ , / , it will be trigger an exception when Segment entity build a json string to insert into elasticsearch.

Redis plugin cannot work on tomcat

Prepare for release 3.0.1

* feature/159:
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  Add log4j.xml into test package

modify the expose port of collector image

The opentracing-toolkit context can not propagation across process

Fix a bug and improve performance

Push the collector docker image when sky-walking is tagged