Symlink function for unsupported file systems
Symlink function for unsupported file systems

Created `symlink` function to be used in place of `ln -s`.

`symlink` will fall back on `cp -R` when `ln -s` fails.  Fixes #301.

kbsriram/end-to-end,sirdarckcat/end-to-end,dconnolly/google-end-to-end,google/end-to-end,Endika/end-to-end,adhintz/end-to-end,rcchan/end-to-end,kbsriram/end-to-end,kbsriram/end-to-end,google/end-to-end,koto/end-to-end-1,dconnolly/google-end-to-end,kbsriram/end-to-end,kbsriram/end-to-end,rcchan/end-to-end,Endika/end-to-end,adhintz/end-to-end,Endika/end-to-end,koto/end-to-end-1,dconnolly/google-end-to-end,rcchan/end-to-end,google/end-to-end,Endika/end-to-end,adhintz/end-to-end,sirdarckcat/end-to-end,sirdarckcat/end-to-end,koto/end-to-end-1,sirdarckcat/end-to-end,Endika/end-to-end,google/end-to-end,sirdarckcat/end-to-end,koto/end-to-end-1,rcchan/end-to-end,koto/end-to-end-1,google/end-to-end,adhintz/end-to-end,adhintz/end-to-end,dconnolly/google-end-to-end