Import stanford hints

I tried a number of approaches you suggested, but all of them, including this one, rerun the body of "file STANFORD_HINTS_IMPORTED" every time "seed rake:all" is run.

spertus-macbookair:dashboard spertus$ ls -al config/stanford-hints-bestPath1.tsv config/scripts/.hints_imported 
-rw-r--r--  1 spertus  5000        0 Jul 18 12:22 config/scripts/.hints_imported
-rw-r--r--  1 spertus  5000  5844943 Jul 14 11:15 config/stanford-hints-bestPath1.tsv
spertus-macbookair:dashboard spertus$ rake seed:all
spertus-macbookair:dashboard spertus$ ls -al config/stanford-hints-bestPath1.tsv config/scripts/.hints_imported 
-rw-r--r--  1 spertus  5000        0 Jul 18 12:29 config/scripts/.hints_imported
-rw-r--r--  1 spertus  5000  5844943 Jul 14 11:15 config/stanford-hints-bestPath1.tsv