DEV: Make the other example charts larger as well

zipline/examples/buyapple.py

@@ -42,4 +42,4 @@ if __name__ == '__main__':
     results.portfolio_value.plot(ax=ax1)
     ax2 = plt.subplot(212, sharex=ax1)
     data.AAPL.plot(ax=ax2)
-    plt.show()
+    plt.gcf().set_size_inches(18, 8)

zipline/examples/dual_ema_talib.py

@@ -89,4 +89,4 @@ if __name__ == '__main__':
     ax2.plot(results.ix[results.sell].index, results.short_ema[results.sell],
              'v', markersize=10, color='k')
     plt.legend(loc=0)
-    plt.show()
+    plt.gcf().set_size_inches(18, 8)

zipline/examples/pairtrade.py

@@ -131,4 +131,4 @@ if __name__ == '__main__':
     results.zscores.plot(ax=ax2, color='r')
     plt.ylabel('zscored spread')
 
-    plt.show()
+    plt.gcf().set_size_inches(18, 8)