posterdown_memoir phased to posterdown_pdf

Fully-ish customised sizing of the poster and colours :partly_sunny:
diff --git a/.Rproj.user/441ADA46/sources/per/t/27AE7CA7 b/.Rproj.user/441ADA46/sources/per/t/27AE7CA7
new file mode 100644
index 0000000..3f4b3a0
--- /dev/null
+++ b/.Rproj.user/441ADA46/sources/per/t/27AE7CA7
@@ -0,0 +1,22 @@
+{
+    "collab_server" : "",
+    "contents" : "",
+    "created" : 1546701554859.000,
+    "dirty" : false,
+    "encoding" : "UTF-8",
+    "folds" : "",
+    "hash" : "4238849555",
+    "id" : "27AE7CA7",
+    "lastKnownWriteTime" : 1546700391,
+    "last_content_update" : 1546700391,
+    "path" : "~/Documents/GitHub/posterdown/R/posterdown_pdf.R",
+    "project_path" : "R/posterdown_pdf.R",
+    "properties" : {
+        "cursorPosition" : "0,23",
+        "scrollLine" : "0"
+    },
+    "relative_order" : 2,
+    "source_on_save" : false,
+    "source_window" : "",
+    "type" : "r_source"
+}
\ No newline at end of file