ImageMagick move to internal and other updates

[TheCakeIsNaOH]

Hey, @bdukes

Fixes #35 Fixes #28 Might fix #16

• Includes the installers inside the package
  • .gitignores .exe files
  • Adds legal folder for required LICENSE.txt and VERIFICATION.txt files
  • Removes url related items from install script.
  • updates update.ps1 to download the files, and to replace links in VERIFICATION.txt
• Adds NoDesktop package parameter.
• Misc other updates.
  • Updates the .nuspec schema
  • Changes to staticaly.com for the icon link because rawgit is shut down.
  • Removes admin tag, which is no longer recommended.
  • Replace won’t with won't
  • Add softwareName to packageArgs, should help uninstall be more reliable.