Generate go file that represent VersionInfo struct

[linquize]

go generate a .go file from versioninfo.json.

This allows the program to get version info from a global variable. For example, when starting the program, it prints the program name, version and copyright from a global variable.
This is also useful in non-Windows platforms too.
Every time when preparing a program release, the developer only need to update versioninfo.json.

[coveralls]

Coverage decreased (-1.0%) to 92.291% when pulling 4e854d1 on linquize:writego into e59661e on josephspurrier:master.

[linquize]

test coverage increased

[msays2000]

Will this be checked in anytime soon :) or should we work with a fork of this code.

[linquize]

@msays2000 Oh, you have just forked the project and merged me code.

[msays2000]

yes, I was testing to see if the PR will work to generate the versionInfo.go file. It does but in forked branch I had to change the import paths.

I think many will just like a short version format string rather than a full deserialized struct object may be a small method to return the semantic version.

const Version = "x.x.x.x"

[msays2000]

btw, I have deleted my fork after testing.

[josephspurrier]

I need to test this locally - let me see if I can get to it this weekend. Sorry for the delay.

[josephspurrier]

Thanks for adding in this functionality! I made it optional and changed the name of the parameters to be more descriptive.