Added Mac OS X support

[ptitvert]

As promised here is the OS X Support, until I find the time for the other OS, like OpenBSD, FreeBSD and AIX.
And until I get also the time to add a bit more comments :-D

[dblock]

First, this is fantastic.

Now, edit .travis.yml and set it up to also run on OSX, see this doc. It will also run this pull request, so we can make sure it works.

README needs an update, too.

Squash your commits.

[ptitvert]

I hope I found how to do it, since this is my first try with Travis !! :-)

[dblock]

It looks good. Unfortunately Travis is not accepting enabling OSX builds anymore for open-source projects, as per http://blog.travis-ci.com/2014-05-13-multi-os-feature-available, but I will see with them at some point :)

[dblock]

I got this on my OSX laptop, haven't debugged (yet).

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running oshi.SystemInfoTest
Tests run: 3, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.397 sec <<< FAILURE!
testGetProcessors(oshi.SystemInfoTest)  Time elapsed: 0.011 sec  <<< ERROR!
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.rangeCheck(ArrayList.java:653)
    at java.util.ArrayList.get(ArrayList.java:429)
    at oshi.util.ExecutingCommand.getFirstAnswer(ExecutingCommand.java:46)
    at oshi.software.os.mac.MacHardwareAbstractionLayer.getProcessors(MacHardwareAbstractionLayer.java:34)
    at oshi.SystemInfoTest.testGetProcessors(SystemInfoTest.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
    at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
    at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
    at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)

Running oshi.util.FormatUtilTest
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.003 sec

Results :

Tests in error: 
  testGetProcessors(oshi.SystemInfoTest): Index: 0, Size: 0

[dblock]

Closes #6.

[ptitvert]

Thanks for the output, I've corrected it now. Should work for all version of OS-X... at least from 10.3 :-)