Fix/reflection warnings [Working]

[ghost]

Elaborates on top of #27. Fixed a refactoring bug turning Path.resolve into clojure.core/resolve and that prevented the test suite to run correctly. Can be merged as is and #27 discarded.

Test results:

lein test
Compiling 4 source files to /Users/clement/Documents/Code/Clojure/GitHub/hawk/target/classes
warning: [options] bootstrap class path not set in conjunction with -source 7
1 warning
Compiling hawk.watcher

lein test hawk.core-test

Ran 4 tests containing 27 assertions.
0 failures, 0 errors.