added travis yml
Merge pull request #52 from rmetzger/gith_ozone_travis_integration

Travis-CI configuration
Ensured proper setup of logging framework in system integration tests.
Fixed bug where test temp files were not cleaned up.
Iteration head tasks are not merged with first operator in superstep, if there is a local strategy that needs to be executed directly prior to the first superstep.
Updated Maven artifacts version to 0.2-ozone.
Allows deploying Ozone to a local repository next to a vanilla Stratosphere distribution.
fixed: ArrayIndexOutOfBoundsException when reading test input > 32KB
fixed: multiplexing deadlock
re-openable hashjoin integration test
Changed memory segment to use "unsafe" (native) memory accesses.
Mapped normalized key comparisons and record swapping in sorters to memory segment operations.