[JBVFS-199] RealFileSystem:exists is not case sensitive in windows
leading to a compilation failure with undertow and jbossweb

Conflicts:
	src/test/java/org/jboss/test/vfs/FileVFSUnitTestCase.java
Merge pull request #21 from elguardian/BZ-1127999

[BZ-1127999] RealFileSystem:exists is not case sensitive in windows
Ignore test on windows & fix checkstyle