"Better specs" applied to parser test

   * Test files for parser moved deeper
   * Relying more on Marshal
Specs for .parse_headers()
Removing old line (forgotten?)
.location specs
Removing forgotten debugger depedencies
Locations parsing fix, handling exotic media types
Parser specs almost finalized.
Location extracor made compatible with String type
Testing more Location combinations in headers
Merge pull request #52 from sustr4/specupdate

Another batch of specs, focusing on Occi::Parser