Add test for Tarsnap testvectors to low-level scrypt interface
Fix Travis g++ errors
To comply with C89:
 - Moved variable declarations to top of function
 - Constant output buffer inside the function

Moved strlen calls from main to inside function to make code easier to read.

Also switched from fancy quotes to single quotes in expected output
Change spaces to tab in Makefile.am after pwhash_scrypt_ll addition
Merge pull request #167 from truenull/master

Tarsnap test vectors tested on Windows