Changed InvalidFileException to XMLException

All tests pass.
Merge branch 'master' of https://github.com/ShannonBolton/jsu-mcis-cs310-groupOne

Conflicts:
	src/main/java/edu/jsu/mcis/InvalidFileException.java
	src/test/java/edu/jsu/mcis/InvalidFileExceptionTest.java
Deleted InvalidFileException files.
Merge branch 'master' of https://github.com/ShannonBolton/jsu-mcis-cs310-groupOne