Merge pull request #4 from epatel/master

changed some makefile details
Minor cleanup and added command documentation.

New functions:

 - getFile
 - listFiles
 - fatal
 - handleError
was -> were
Updated copyright notice
Extracted types into separate files

Implemented a few methods on Zip-types
Refactored the command to use the new pinch.Get
Updated usage example
Public field names
Removed use of * math.MaxUint16 (now << 16)
Ignore pinch-test
Added test that currently returns Corrupt file 

(signature error)
Updated the list of files to check.
Replaced use of fmt.Println with call to echo func
Added echoZipEntry func, removed hardcoded offset
Updated output
Disabled debug output (muted echo)
Fixed addition of L + H

 - d.ExternalFileAttributes()
 - d.RelativeOffset()
 - f.CompressedSize()
 - f.OriginalSize()