Added an interface, NavigationalFileManager now implements FileManager
Deleting outdated files.
NavigationalFileManager methods now synchronized
Removing files from .gitignore
Merge pull request #5 from BenBurum/File-Duplicate-Branch

File duplicate branch Eric's branch merge
Merge remote-tracking branch 'origin/BenBranch'

Conflicts:
	.gitignore
	burum-brown/src/main/java/com/agile/findduplicates/FinderPanel.java
	burum-brown/src/test/java/com/agile/findduplicates/FileTest.java
Merge branch 'master' into BenBranch