removed dependency to org.clojure.contrib/java-utils (never used)

Conflicts:
	project.clj
removed dependency to org.clojure.contrib/def
removed dependency to org.clojure.contrib/seq
replaced dependency to org.clojure.contrib/command-line by org.clojure/tools.cli
updated to latest clojure version
updated project.clj to leiningen 2
added .gitignore files
ran slamhound

Conflicts:
	src/net/dishevelled/mailindex/backends/nnml.clj
updated ns declarations by referring only specific functions

Conflicts:
	src/net/dishevelled/mailindex/backends/nnml.clj
updated dependencies javax.mail and apache tika
Merge pull request #1 from foobar27/master

Basic modernization of the code