Save path and cwd in cache files

[alexander-akait]

If use gulp-rename or other pipes for change path and cwd, we save source path and cwd. Resolve #18

[ahaurw01]

Thanks for the PR. I hesitate to incorporate these changes for a few reasons.

• Mutating the cached file's base and path will be a breaking change for some people.
• If there's a desire to reintroduce the files as they were, and not how they have evolved, I think file.clone() is a better option. Maybe gulp-clone is a good step for you in your workflow.
• The goal of this plugin (and all gulp plugins) is always to be simple. Build processes are most effective when complexity is avoided. I urge you again to look at removing complexity from your build process before introducing more into plugins.