Some updates to the default DESCRIPTION file

[ncarchedi]

I started with a clean slate on this pull request to address the issues discussed in #411. For reference, here they are again:

1. http://stackoverflow.com/questions/17662713/devtools-description-file
2. https://gist.github.com/mbannert/8403801

I made the default DESCRIPTION file created by devtools more similar to the default DESCRIPTION file created by RStudio (when creating a new package). Authors@R, License, and Suggests still defer to getOption().

Here's the result of my changes:

> library(devtools)
> create("testPackage")
Creating package testPackage in .
No DESCRIPTION found. Creating with values:

Package: testPackage
Type: Package
Title: What the package does (short line)
Version: 0.1
Date: 2014-02-18
Authors@R: "First Last <first.last@example.com> [aut, cre]"
Description: More about what it does (maybe more than one line)
Depends: R (>= 3.0.2)
License: What license is it under?
LazyData: true
Adding Rstudio project file to testPackage

And immediately calling document(), which caused an error with the previous default value for Authors@R:

> document("testPackage")
Updating testPackage documentation
Loading testPackage
Updating namespace directives
Writing testPackage.Rd
> 

Finally, after setting some options (temporarily):

> options(devtools.desc.author = '"Nick Carchedi <nick.carchedi@example.com> [aut, cre]"', devtools.desc.license = "GPL (>= 2)")
> create("testPackage2")
Creating package testPackage2 in .
No DESCRIPTION found. Creating with values:

Package: testPackage2
Type: Package
Title: What the package does (short line)
Version: 0.1
Date: 2014-02-18
Authors@R: "Nick Carchedi <nick.carchedi@example.com> [aut, cre]"
Description: More about what it does (maybe more than one line)
Depends: R (>= 3.0.2)
License: GPL (>= 2)
LazyData: true
Adding Rstudio project file to testPackage2
>

[hadley]

I think this can be omitted since it's the default.

[hadley]

Looks good. A few minor points inline.

[ncarchedi]

All good suggestions. Here's the new output:

> create("testPackage")
Creating package testPackage in .
No DESCRIPTION found. Creating with values:

Package: testPackage
Title: What the package does (short line)
Version: 0.1
Authors@R: "First Last <first.last@example.com> [aut, cre]"
Description: What the package does (paragraph)
Depends: R (>= 3.0.2)
License: What license is it under?
LazyData: true
Adding Rstudio project file to testPackage
> 

[hadley]

Great. Could you please add a bullet point to NEWS.md briefly describing the change and thanking yourself (via your github username)

[ncarchedi]

Sure, thanks!

You might consider bringing the RStudio defaults in line with the new devtools defaults. When you create a new package project in RStudio, here's what it gives you:

Package: testPackage
Type: Package
Title: What the package does (short line)
Version: 1.0
Date: 2014-02-21
Author: Who wrote it
Maintainer: Who to complain to <yourfault@somewhere.net>
Description: More about what it does (maybe more than one line)
License: What license is it under?

[hadley]

Thanks. @jjallaire if you get a chance, it'd be great if the rstudio defaults matched this.