Merge pull request #2 from tmtk75/master

fix an example for norikra-client
fix to convert from norikra primitive types to esper types
Add norikra primitive types, fix not to use esper types directly
  * to avoid conflicts of mismatch between int-long and float-double
    * user defines 'int' types, but integer numbers in queries are long
v0.1.1: norikra types
remove oraclejdk6 from supported list (for TravisCI)
fix to use jruby path of running process itself to escape rbenv invasion
v0.1.2
docs (Performance and Tips sections)
add documents UDFs and how to execute/test