Issue #45: resolved many checkstyle violations

[rnveach]

Issue #45

[rnveach]

I thought I could fix one catch Exception, but it turns out the test was looking for an NPE so I reverted it.

Failed tests: 
  CheckstyleExecutorTest.executeException 
Expected: (an instance of java.lang.IllegalStateException and exception with message a string containing "Can not execute Checkstyle")
     but: an instance of java.lang.IllegalStateException <java.lang.NullPointerException> is a java.lang.NullPointerException

Stacktrace was: java.lang.NullPointerException
	at com.puppycrawl.tools.checkstyle.Checker.fireAuditStarted(Checker.java:252)
	at com.puppycrawl.tools.checkstyle.Checker.process(Checker.java:206)
	at org.sonar.plugins.checkstyle.CheckstyleExecutor.executeWithClassLoader(CheckstyleExecutor.java:101)
	at org.sonar.plugins.checkstyle.CheckstyleExecutor.execute(CheckstyleExecutor.java:73)
	at org.sonar.plugins.checkstyle.CheckstyleExecutorTest.executeException(CheckstyleExecutorTest.java:95)

[romani]

Test should be changed. NPE should not be expected in any code. NPE is clear sign of unexpected situation