Missing tests

[cblichmann]

See subject, there are currently no tests. The following should be implemented, in order of priority:

1. End-to-end testing: Run jailtime on test/testfile.jailspec and check for the expected directory structure
2. Unit tests for spec parsing
3. Unit tests for the ELF and Mach-O parsing code
4. Unit tests for the copy package, as this is now sufficiently complex

[cblichmann]

• Added test for ELF parsing
• Added test for copy package

[cblichmann]

• Added test for ldconfig format parsing
• Added test for linux loader
• Added tests for .jailspec parsing