Create URKFileInfo and create new listFiles method that returns rar file metadata
Fix tests for listFiles method name change and add tests for listFileInfo
Amended formatting and documentation, changed init to be instancetype instead of id
Adjusted public API for URKFileInfo, and added full documentation for it
Fixed bug in unit test causing improper timestamp evaluation
Spruced up listFileInfo unit test, replacing custom CRC implementation with lib's, and expanding coverage of URKFileInfo
Merged in list_file_metadata branch (Issue #8)
Removed trailing semicolons from signatures of  method implementations, performed various other cleanup
Added unicode test for testListFileInfo, made new testListFileInfo* methods' names consistent with the rest, and fixed a unicode bug for the archive's name in the init method