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Previously, the folder hierarchy of a file reference in project navigator was
forced to be the same as its physical folder hierarchy on disk.

This CL refactors xcode_object.h and xcode_object.cc to enable specifying a
navigator folder hierarchy when generating a file reference and it is allowed to
be completely different from the physical one.

This CL also corrects the mi-uses between "name" and "path" in PBXFileReference
and PBXGroup. Take "ios/tool.cc" as an example, name should be "tool.cc", while
path should be "ios/tool.cc", and they are different.

BUG=614818

Review-Url: https://codereview.chromium.org/2576773002
Cr-Commit-Position: refs/heads/master@{#439429}