Add support for all repositories (regardless of code style)

[ExE-Boss]

This PR fixes this list of issues I found in the script:

• Doesn't work license headers and code documentation, which are written like so:

  /**
   * The following object does stuff
   * @type Object
   */
  var obj = {
  	longValueName:	"This string is long",
  	foo:	"foo",
  	bar:	"bar",
  	getBaz	= function getBaz()
  	{
  		return bar;
  	}
  }

  This should render as:

  /**
   * The following object does stuff
   * @type Object
   */
  var obj = {
          longValueName: "This string is long",
          foo:           "foo",
          bar:           "bar",
          getBaz         = function getBaz()
          {
                  return bar;
          }
  }

  But because of the does line start with a space check in index.js#41, this doesn't happen, because the second line of this file turns elastic tabstops off.
• Fixes broken tab size:
  This is done by using the ch unit instead of the em unit
• Fixes broken tab alignment:
  This is done by ensuring that the wrapAllTabs() function doesn't try to wrap a tab multiple times.
• Moves the custom CSS into github.user.css to be loaded by Stylus or Stylish.
  This makes it an optional feature rather than something that users are forced to use.

[hax]

Thank you for the PR. It would be better if you could separate it to multiple PRs for each feature/bugfix.

[ExE-Boss]

@hax I have split off this PR into #4, #5 and #6. #4 and #6 are ready to be merged.