Commits between 0.1 and 0.2

Closed issues for 0.2

• Retrieve aggregate type from the underlying type (issue #4)
• Fix aggregate select types naming convention in fedex_plus (issue #59)
• Fix several segfaults and double free's in p21read (issue #63)
• Fix several file read/write bugs in p21read, including
  • don't write '$' for empty string
  • 'abc\S'def' is a valid string (issue #57)
• Improve p21read execution time
• Cleanup many files and delete src/clivfasd (but much more to do!) (issue #66)
• Add BNF files, schemas, and CAX-IF Part 21 files