Code Formatting

Reformatted random formatting in many of the files:
  + mixed tabs and spaces
  + mixed indentation lengths

I formatted all of the .java files in src/main/java to use what seemed
to be the most common format of using spaces with an indent size of 2.

Also removed an uneeded variable here and there.
JmeterSummarizerParser - Cleanup

+ Added try-finally's to ensure closing of Scanner objects
+ Removed unnecessary IOException in catch-clause (unreachable clause)
+ Removed unneccessary import
Resolved Deprecation Warning

Updated instantiation of StreamTaskListener with System.err to use the
fromStderr() constructor in PerformanceBuildAction.java
PerformanceProjectAction - cleanup

+ Added @SuppressWarnings for serialVersionUID
+ Removed unused local variable (range)
+ Added type-parameters to return type of getTrendReportData
+ Removed private default-constructor of Range class
PerformancePublisher - cleanup

+ Removed unused local variables
+ Resolved warning with static-member access (this -> PerformancePublisher)
Merge pull request #27 from JohnMurray/clean-up

Thanks