Added an example for page-background.

examples/page-background/backgrounds/background1.pdf

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examples/page-background/backgrounds/background10.pdf

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examples/page-background/backgrounds/background4.pdf

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examples/page-background/backgrounds/background5.pdf

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examples/page-background/backgrounds/background7.pdf

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examples/page-background/page-background.md

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+---
+title: "Vinaque sanguine metuenti cuiquam Alcyone fixus"
+author: [Author Name]
+date: "2017-02-20"
+subject: "Markdown"
+keywords: [Markdown, Example]
+subtitle: "Aesculeae domus vincemur et Veneris adsuetus lapsum"
+lang: "en"
+page-background: "backgrounds/background1.pdf"
+...
+
+# Vinaque sanguine metuenti cuiquam Alcyone fixus
+
+## Aesculeae domus vincemur et Veneris adsuetus lapsum
+
+Lorem markdownum Letoia, et alios: figurae flectentem annis aliquid Peneosque ab
+esse, obstat gravitate. Obscura atque coniuge, per de coniunx, sibi **medias
+commentaque virgine** anima tamen comitemque petis, sed. In Amphion vestros
+hamos ire arceor mandere spicula, in licet aliquando.
+
+```java
+public class Example implements LoremIpsum {
+	public static void main(String[] args) {
+		if(args.length < 2) {
+			System.out.println("Lorem ipsum dolor sit amet");
+		}
+	} // Obscura atque coniuge, per de coniunx
+}
+```
+
+Porrigitur et Pallas nuper longusque cratere habuisse sepulcro pectore fertur.
+Laudat ille auditi; vertitur iura tum nepotis causa; motus. Diva virtus! Acrota
+destruitis vos iubet quo et classis excessere Scyrumve spiro subitusque mente
+Pirithoi abstulit, lapides.
+
+## Lydia caelo recenti haerebat lacerum ratae at
+
+Te concepit pollice fugit vias alumno **oras** quam potest
+[rursus](http://example.com#rursus) optat. Non evadere orbem equorum, spatiis,
+vel pede inter si.
+
+1. De neque iura aquis
+2. Frangitur gaudia mihi eo umor terrae quos
+3. Recens diffudit ille tantum
+
+\begin{equation}\label{eq:neighbor-propability}
+    p_{ij}(t) = \frac{\ell_j(t) - \ell_i(t)}{\sum_{k \in N_i(t)}^{} \ell_k(t) - \ell_i(t)}
+\end{equation}
+
+Tamen condeturque saxa Pallorque num et ferarum promittis inveni lilia iuvencae
+adessent arbor. Florente perque at condeturque saxa et ferarum promittis tendebat. Armos nisi obortas refugit me.
+
+Et nepotes poterat, se qui. Euntem ego pater desuetaque aethera Maeandri, et
+[Dardanio geminaque](http://example.com#Dardanio_geminaque) cernit. Lassaque poenas
+nec, manifesta $\pi r^2$ mirantia captivarum prohibebant scelerato gradus unusque
+dura.
+
+- Permulcens flebile simul
+- Iura tum nepotis causa motus diva virtus Acrota. Tamen condeturque saxa Pallorque num et ferarum promittis inveni lilia iuvencae adessent arbor. Florente perque at ire arcum.