Update instructions for setting up RubyGems.org account

I tried using the 'curl' command but got errors about certificates.  After searching for many hours, I found out that Anaconda had installed itself in my path and I was using a different curl version.  Also, OpenSSL that is installed with Max OS X is different than the one installed with brew.  So, I finally figured out that if I just use the URL in my browser, everything works and I can avoid the hassles of curl and security certificates.  I don't know why this is happening and I don't know what certificate is used by the RubyGems.org server.  But it seems that the browser is perfectly happy with the certificate, however curl complains about the certificate.
Merge pull request #49 from mpapis/gh-pages

update rvm link in c-extensions.md
Update make-your-own-gem.md

In Gem::Specification.new's block, added entry for new files.
Merge pull request #47 from simplytech/patch-1

Update instructions for setting up RubyGems.org account
Merge pull request #50 from vision2910/patch-1

Update make-your-own-gem.md
Copy edits
Add Pat Allen's 'Crafting Gems' tutorial to resources
Update make-your-own-gem.md

removed namespace from translator class declaration, as it was causing error.
Merge pull request #51 from vision2910/patch-2

Update make-your-own-gem.md
Replace curl with first-time login instructions
Add another link to the resources page
Import How to Name Gems from my blog

This makes my recommendation from several years ago look more official.
Fix newline after require
Add paragraph about mixing _ and -

Suggested by Ryan Fitzgerald
Rearrange name-your-gem.md, add Bundler reference
Merge pull request #52 from rf-/gh-pages

Rearrange name-your-gem.md, add Bundler reference
fixes next page in guides navigation
Merge pull request #53 from zjjz/refs-update

Fixes a minor navigation issue for the command reference
Adds license attribute to the sample gemspec

Including a license in your gemspec is a good practice.
[Make the world a better place; put a license in your gemspec](http://www.benjaminfleischer.com/2013/07/12/make-the-world-a-better-place-put-a-license-in-your-gemspec/)
Merge pull request #54 from zjjz/feature-spec-add-license

Adds license attribute to the sample gemspec