close #186: escape @ in the email address so Pandoc won't convert it to \href{}

Author: yihui

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: rticles
 Type: Package
 Title: Article Formats for R Markdown
-Version: 0.5.3
+Version: 0.5.4
 Authors@R: c(
   person("JJ", "Allaire", role = "aut", email = "[email protected]"),
   person("Yihui", "Xie", role = c("aut", "cre"), email = "[email protected]", comment = c(ORCID = "0000-0003-0645-5666")),

inst/rmarkdown/templates/rss_article/skeleton/skeleton.Rmd

@@ -7,13 +7,13 @@ affiliation: "Affiliation"
 address: "Address"
 city: "City"
 country: "Country"
-email: "email (at) address"
+email: "email1\\@example.com"
 author2: "Author 2"
 affiliation2: "Affiliation"
 address2: "Address"
 city2: "Los Angeles"
 country2: "Country"
-email2: "email (at) address"
+email2: "email2\\@example.com"
 abstract: |
   Abstract goes here
 keywords: keywords