Accurate root node path

• As I reveiced an one-time, non-reproducible bug, that the root node path (xcodeproj dir name) was not correct; now I got the root node path found from pbxproj file instead of path name of xcodeproj dir.
  • It is backward compatible that there is a suffix .xcodeproj added to the found PBXProject name.
• Other polishings:
  • corrected wrong pre-push hook script in README
  • add two new supported types in README, xUnique could handle them without new code
  • add more verbose output and xUnique would generate a result json file in verbose mode (using -v)
  • make path name clear in source code